Question

net ionic equation of CaCO3+HCl---> CaCl2+H2CO3

Answer 1

Carbonic acid is an unstable acid, though, so it undergoes this reaction spontaneously:

H₂CO₃ --> H₂O + CO₂

CaCO₃(s) + 2 HCl(aq) -----> CaCl₂(aq) + CO₂(g) + H₂O(l)

CaCO₃(s) = Insoluble in water so no ions from it.
2HCl(aq) = aqueous so it is ionized to 2H⁺ and 2Cl^-
CaCl₂(aq) = aqueous so it is ionized to Ca²⁺ and 2Cl^-
CO₂(g) = Gas so no ionization
H₂O(l) = Liquid so no ionization (only aqueous compounds ionize).

So rewrite the reaction with everything split into their ions.

CaCO₃(s) + 2H⁺ + 2Cl^- = Ca²⁺ + 2Cl^- + CO₂(g) + H₂O(l)

now cancel any ions that apear on both sides of the equation.

and the answer becomes:

CaCO₃(s) + 2H⁺ -----> Ca²⁺ + CO₂(g) + H₂O(l)