https://www.sciencemadness.org/smwiki/index.php?title=Round-bottom_flask&feed=atom&action=historyRound-bottom flask - Revision history2024-03-29T02:21:22ZRevision history for this page on the wikiMediaWiki 1.25.1https://www.sciencemadness.org/smwiki/index.php?title=Round-bottom_flask&diff=15065&oldid=prevMabus: /* Types */2023-07-10T19:20:44Z<p><span dir="auto"><span class="autocomment">Types</span></span></p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>*''Multiple necks'': The spherical flask has one or more ground glass joints, usually of different sizes. In case of flasks with 4 or more ground glass joint necks, the necks are positioned at equal distances from the central main neck as well as the other necks.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>*''Multiple necks'': The spherical flask has one or more ground glass joints, usually of different sizes. In case of flasks with 4 or more ground glass joint necks, the necks are positioned at equal distances from the central main neck as well as the other necks.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>*''Evaporating flask'': Shaped like a tear, they are often used in [[rotary evaporator]]s to remove or distill solvents.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>*''Evaporating flask'': Shaped like a tear, they are often used in [[rotary evaporator]]s to remove or distill solvents.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>*''Pear-shaped'': Used for small scare reactions, when working with small amounts of reagent. Pear-shaped flasks bigger than 100 ml exist, though they're rarely used. The name "heart-shaped flask" is sometimes used.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>*''Pear-shaped'': Used for small scare reactions, when working with small amounts of reagent. Pear-shaped flasks bigger than 100 ml exist, though they're rarely used. The name "heart-shaped flask" is sometimes used<ins class="diffchange diffchange-inline">, as evaporating flasks are sometimes called pear-shaped due to their shape similar to that of a pear</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==Round-bottom vs flat-bottom==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==Round-bottom vs flat-bottom==</div></td></tr>
</table>Mabushttps://www.sciencemadness.org/smwiki/index.php?title=Round-bottom_flask&diff=13330&oldid=prevMabus at 19:17, 7 September 20202020-09-07T19:17:01Z<p></p>
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</tr><tr><td colspan="2" class="diff-lineno" id="L23" >Line 23:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Inspect the flasks for any cracks. RBFs with any defects cannot be used when working with vacuum.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Inspect the flasks for any cracks. RBFs with any defects cannot be used when working with vacuum.</div></td></tr>
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<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>To make sure they don't roll over the table and fall, RBFs should be placed on [[cork ring]]s.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>To make sure they don't roll over the table and fall, RBFs should be placed on [[cork ring]]s <ins class="diffchange diffchange-inline">or in Berzelius flasks</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==See also==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==See also==</div></td></tr>
</table>Mabushttps://www.sciencemadness.org/smwiki/index.php?title=Round-bottom_flask&diff=11799&oldid=prevMabus at 20:13, 23 July 20192019-07-23T20:13:32Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==General==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==General==</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Round-bottom flasks are spherical flasks, made of borosilicate glass (or rarer [[Polytetrafluoroethylene|PTFE]]), with one or more ground glass necks. Usually, the main neck has a larger diameter than the other necks, though flasks with equal diameter necks exist. Size of the ground glass joint depends on the volume of the flask, for example a flask with a volume of 5 or 10 ml cannot have a 29/32 or 29/40 ground glass joint, but it can have 14/23 or 19/24. "Flasks" with the former dimensions, if they exist, are actually ground glass joint female cap plug/stoppers, are often used when working with [[Schlenk line]]s, to stopper the male joint of [[dropping funnel]]s or other glassware with male joints, often when connecting it to the solvent line to collect solvent.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Round-bottom flasks are spherical flasks, made of borosilicate glass (or rarer [[Polytetrafluoroethylene|PTFE]]), with one or more ground glass <ins class="diffchange diffchange-inline">joint </ins>necks. Usually, the main neck has a larger diameter than the other necks, though flasks with equal diameter necks exist. Size of the ground glass joint depends on the volume of the flask, for example a flask with a volume of 5 or 10 ml cannot have a 29/32 or 29/40 ground glass joint, but it can have 14/23 or 19/24. "Flasks" with the former dimensions, if they exist, are actually ground glass joint female cap plug/stoppers, are often used when working with [[Schlenk line]]s, to stopper the male joint of [[dropping funnel]]s or other glassware with male joints, often when connecting it to the solvent line to collect solvent<ins class="diffchange diffchange-inline">.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">Round-bottom flasks with ball-and-socket joints are used in [[rotary evaporator]]s, as receiving flasks, since said joints allow easy handling of flasks without the risk of freezing, and don't require greasing or sleeve joints</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==Types==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==Types==</div></td></tr>
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</table>Mabushttps://www.sciencemadness.org/smwiki/index.php?title=Round-bottom_flask&diff=10138&oldid=prevMabus at 21:16, 2 December 20182018-12-02T21:16:06Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==Round-bottom vs flat-bottom==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==Round-bottom vs flat-bottom==</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>While flat-bottom flasks, like Erlenmeyers with ground glass joints, can be used directly on hotplates without needing a [[heating bath]]/[[heating mantle]] and supporting clamps, round-bottom flasks handle vacuum much better and will ensure an even boiling, whereas flat-bottom flasks no not distribute heat evenly. Likewise, it's much easier to remove the content of a round-bottom flask, compared to the flat-bottom one.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>While flat-bottom flasks, like Erlenmeyers with ground glass joints, can be used directly on hotplates without needing a [[heating bath]]/[[heating mantle]] and supporting clamps, round-bottom flasks handle vacuum much better and will ensure an even boiling, whereas flat-bottom flasks no not distribute heat evenly<ins class="diffchange diffchange-inline">, with the bottom getting hot too fast compared to the top, which may increase bumping</ins>. Likewise, it's much easier to remove the content of a round-bottom flask, compared to the flat-bottom one.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==Availability==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==Availability==</div></td></tr>
</table>Mabushttps://www.sciencemadness.org/smwiki/index.php?title=Round-bottom_flask&diff=9867&oldid=prevMabus at 21:26, 8 November 20182018-11-08T21:26:10Z<p></p>
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<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Round-bottom flasks can be purchased from lab suppliers and online. Price depends on the size, type and complexity (<del class="diffchange diffchange-inline">nr. </del>of necks).</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Round-bottom flasks can be purchased from lab suppliers and online. Price depends on the size, type and complexity (<ins class="diffchange diffchange-inline">number </ins>of necks).</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
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</table>Mabushttps://www.sciencemadness.org/smwiki/index.php?title=Round-bottom_flask&diff=9174&oldid=prevMabus at 14:25, 29 June 20182018-06-29T14:25:49Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==General==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==General==</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Round-bottom flasks are spherical flasks, made of borosilicate glass (or rarer [[Polytetrafluoroethylene|PTFE]]), with one or more ground glass necks. Usually, the main neck has a larger diameter than the other necks, though flasks with equal diameter necks exist. Size of the ground glass joint depends on the volume of the flask, for example a flask with a volume of 5 or 10 ml cannot have a 29/32 or 29/40 ground glass joint, but it can have 14/23 or 19/24. "Flasks" with the former dimensions, if they exist, are actually ground glass joint female cap plug/stoppers, are often used when working with [[Schlenk line]]s, to stopper the male joint of [[dropping funnel]]s, when connecting it to the solvent line to collect solvent.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Round-bottom flasks are spherical flasks, made of borosilicate glass (or rarer [[Polytetrafluoroethylene|PTFE]]), with one or more ground glass necks. Usually, the main neck has a larger diameter than the other necks, though flasks with equal diameter necks exist. Size of the ground glass joint depends on the volume of the flask, for example a flask with a volume of 5 or 10 ml cannot have a 29/32 or 29/40 ground glass joint, but it can have 14/23 or 19/24. "Flasks" with the former dimensions, if they exist, are actually ground glass joint female cap plug/stoppers, are often used when working with [[Schlenk line]]s, to stopper the male joint of [[dropping funnel]]s <ins class="diffchange diffchange-inline">or other glassware with male joints</ins>, <ins class="diffchange diffchange-inline">often </ins>when connecting it to the solvent line to collect solvent.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==Types==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==Types==</div></td></tr>
</table>Mabushttps://www.sciencemadness.org/smwiki/index.php?title=Round-bottom_flask&diff=8707&oldid=prevMabus: /* Handling */2018-05-05T06:49:22Z<p><span dir="auto"><span class="autocomment">Handling</span></span></p>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 06:49, 5 May 2018</td>
</tr><tr><td colspan="2" class="diff-lineno" id="L20" >Line 20:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==Handling==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==Handling==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Inspect the flasks for any cracks. RBFs with any defects cannot be used when working with vacuum.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Inspect the flasks for any cracks. RBFs with any defects cannot be used when working with vacuum.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">To make sure they don't roll over the table and fall, RBFs should be placed on [[cork ring]]s.</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==See also==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==See also==</div></td></tr>
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</table>Mabushttps://www.sciencemadness.org/smwiki/index.php?title=Round-bottom_flask&diff=8257&oldid=prevMabus: Created page with "{{Stub}} A 250 ml RBF with [[sulfur dichloride]] A '''round-bottom flask''' (also called '''boiling flask''', '''round-bottomed flas..."2018-02-10T18:36:39Z<p>Created page with "{{Stub}} <a href="/smwiki/index.php/File:Sulfur_dichloride.JPG" title="File:Sulfur dichloride.JPG">A 250 ml RBF with [[sulfur dichloride</a>]] A '''round-bottom flask''' (also called '''boiling flask''', '''round-bottomed flas..."</p>
<p><b>New page</b></p><div>{{Stub}}<br />
[[File:Sulfur dichloride.JPG|thumb|350px|A 250 ml RBF with [[sulfur dichloride]]]]<br />
A '''round-bottom flask''' (also called '''boiling flask''', '''round-bottomed flask''', '''round bottom''') or '''RBF''' for short, is a type of flask with spherical bottom used as laboratory glassware, mostly often for synthesis and in distillations.<br />
<br />
==General==<br />
Round-bottom flasks are spherical flasks, made of borosilicate glass (or rarer [[Polytetrafluoroethylene|PTFE]]), with one or more ground glass necks. Usually, the main neck has a larger diameter than the other necks, though flasks with equal diameter necks exist. Size of the ground glass joint depends on the volume of the flask, for example a flask with a volume of 5 or 10 ml cannot have a 29/32 or 29/40 ground glass joint, but it can have 14/23 or 19/24. "Flasks" with the former dimensions, if they exist, are actually ground glass joint female cap plug/stoppers, are often used when working with [[Schlenk line]]s, to stopper the male joint of [[dropping funnel]]s, when connecting it to the solvent line to collect solvent.<br />
<br />
==Types==<br />
*''Simple'': Consists of a simple spherical flask with one ground glass joint.<br />
*''Multiple necks'': The spherical flask has one or more ground glass joints, usually of different sizes. In case of flasks with 4 or more ground glass joint necks, the necks are positioned at equal distances from the central main neck as well as the other necks.<br />
*''Evaporating flask'': Shaped like a tear, they are often used in [[rotary evaporator]]s to remove or distill solvents.<br />
*''Pear-shaped'': Used for small scare reactions, when working with small amounts of reagent. Pear-shaped flasks bigger than 100 ml exist, though they're rarely used. The name "heart-shaped flask" is sometimes used.<br />
<br />
==Round-bottom vs flat-bottom==<br />
While flat-bottom flasks, like Erlenmeyers with ground glass joints, can be used directly on hotplates without needing a [[heating bath]]/[[heating mantle]] and supporting clamps, round-bottom flasks handle vacuum much better and will ensure an even boiling, whereas flat-bottom flasks no not distribute heat evenly. Likewise, it's much easier to remove the content of a round-bottom flask, compared to the flat-bottom one.<br />
<br />
==Availability==<br />
Round-bottom flasks can be purchased from lab suppliers and online. Price depends on the size, type and complexity (nr. of necks).<br />
<br />
==Handling==<br />
Inspect the flasks for any cracks. RBFs with any defects cannot be used when working with vacuum.<br />
<br />
==See also==<br />
*[[Erlenmeyer flask]]<br />
*[[Schlenk flask]]<br />
*[[Volumetric flask]]<br />
<br />
==References==<br />
<references/><br />
===Relevant Sciencemadness threads===<br />
*[http://www.sciencemadness.org/talk/viewthread.php?tid=68112 Round Bottom Flask vs Flat Bottom Round ones]<br />
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[[Category:Lab equipment]]<br />
[[Category:Glassware]]</div>Mabus