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Author: Subject: Make Calcium carbonate from calcite
Housane
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[*] posted on 27-11-2018 at 22:56
Make Calcium carbonate from calcite


Hi All

I have some Calcite and I wanted to purify calcium carbonate from it. What would you suggest is the best way to do this.

Thanks

Housane
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Foeskes
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[*] posted on 28-11-2018 at 02:52


Well if it's clear or white, then I'd say it's pretty pure especially if it's in the form of large crystals.
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[*] posted on 28-11-2018 at 10:19


Hi how can I then make it into a powdered form to make calcium hydroxide what would you subject is best. The chunks are rather large
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fusso
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[*] posted on 28-11-2018 at 12:02


Just heat it up to 8xxC to form CaO. The pressure from released CO2 will break the chunks apart.



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[*] posted on 28-11-2018 at 12:08


Quote: Originally posted by fusso  
Just heat it up to 8xxC to form CaO. The pressure from released CO2 will break the chunks apart.

then add water and a slurry of calcium hydroxide will form (be careful of the exothermic reaction)





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Housane
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[*] posted on 1-12-2018 at 13:44


Hi Ubya how did you get the part at the bottom
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fusso
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[*] posted on 1-12-2018 at 14:47


Quote: Originally posted by Housane  
Hi Ubya how did you get the part at the bottom
Filtering.



Useful sites:
Balance Chemical Equation: http://www.webqc.org/balance.php
Molecular mass and elemental composition calculator: https://www.webqc.org/mmcalc.php
Solubility table: https://en.wikipedia.org/wiki/Solubility_table
It's not crime if noone finds out - Nyaruko
List of materials made by ScienceMadness users:
Remake: https://docs.google.com/spreadsheets/d/1nmJ8uq-h4IkXPxD5svnT...
Original: https://docs.google.com/document/u/1/d/1AoI2VA5L4bmFw2HwXS2O...
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MrHomeScientist
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[*] posted on 3-12-2018 at 14:09


Well calcite is already calcium carbonate, so smash it with a hammer and you're done!

If you want to ensure purity, probably the easiest way would be:
1) Crush the rock as much as you can with a hammer / mortar & pestle.
2) Dissolve the rock in vinegar. May take a few hours or days; wait until the bubbling stops, then add a bit more vinegar and make sure bubbling doesn't start up again.
3) Filter off any undissolved rock. The solution contains calcium acetate.
4) Add baking soda to the solution. This precipitates the calcium back out as carbonate.
4a) It might be better to first dissolve the baking soda in its own solution, then add that to the acetate solution. This way you know the precipitation is done if you add baking soda solution and no more is observed.
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