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Question

CaCO3 + H2O


Solution

CaCO3  contains two ions Ca2+ and CO3^2- 
H2O contains H+ and OH- ions

Positive ion combines with the negative ion
so Ca2+ and OH-combines to form Ca(OH)2 and 
H+and CO3^2- combines to form H2CO3
[note: criss crossing the charge numbers we get the chemical formula of the compounds]
so the equation will be 
CaCO3+2H2O===>Ca(OH)2 +H2CO3 or 
CaCO3+2H2O===> Ca(OH)2+CO2+H2O 

note : H2CO3 usually produces CO2 gas and H2O liquid 

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