Question
Tue March 20, 2012 By:
for preparing calcium carbonate excess of co2 should be avoided since this leads to the fomation of water soluble ca(hco3)2.

sir urgent

Expert Reply
Tue March 27, 2012
When water is saturated with carbondioxide
 
CaCO3 + CO2 + H2O ? Ca(HCO3)2
 
When excess of sodium carbonate is added to calcium chloride
 
Na2CO3+CaCl2=NaCl+CaCO3
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