Elements and Compounds
Calcium

What is calcium carbonate?

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2014-04-06 17:21:39

Calcium carbonate is an ionic salt, formed from the cationic

calcium (II) and the anionic carbonate ion CO32-. It is found

naturally in limestone and in seashells.

vCalcium carbonate reacts with acids, releasing carbon

dioxide:

v

vCalcium carbonate will react with water that is saturated with

carbon dioxide to form the soluble calcium bicarbonate.

CaCO3

+ CO2 + H2O → Ca(HCO3)2

This

reaction is important in the erosion of carbonate rocks, forming

caverns, and leads to hard water in many regions.

Water

with a large amount of dissolved calcium is hard water.


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