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CaCO3(s) + 2HCl(aq) -> CaCl2(aq) + H2CO3(aq)

is the balanced chemical equation

H2CO3 is not stable in this form, so it splits into CO2(g) + H2O(l)

Therefore the true equation will be:

CaCO2(s) + 2HCl(aq) -> CaCl2(aq) + CO2(g) + H2O(l)

You NIE will start like this:

CaCO2(s) + 2H+(aq) + 2Cl-(aq) -> Ca2+(aq) + 2Cl-(aq) + CO2(g) + H2O(l)

and will end as:

2H+(aq) + CaCO2(s) -> Ca2+(aq) + CO2(g) + H2O(l)

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