Irene
Harmless
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Registered: 20-5-2006
Location: Greece
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Preparation of ionic nitrites
I've done the reduction of molten KNO3 with Pb in order to make KNO2.I extracted KNO2 from PbO after putting the crucible in hot water.Then I
concentrated the solution and put HNO3 to neutralize it.At last I concentrated it to dryness and took yellow granules of KNO2.Why is neutralization
necessary in this experiment?
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12AX7
Post Harlot
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Nitrate breaks down, releasing N2 gas. Also, nitrite is probably reduced to elemental nitrogen, similar to the less common but still smelly sulfate
reduction when reacting the acid with iron or zinc (giving off some H2S).
Tim
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Magpie
lab constructor
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Mood: Chemistry: the subtle science.
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I have made NaNO2 using Pb. My procedure did not call for neutralization with HNO3.
See this thread: http://www.sciencemadness.org/talk/viewthread.php?tid=52#pid...
Coincidentally, it has the same title.
The single most important condition for a successful synthesis is good mixing - Nicodem
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