1. Addition of which of the following will increase the solubility of CaCO3 in water? Consider the equilibrium process:
CaCO3(s) <> Ca2 +(aq) + CO32-(aq)
Carefully consider common ions, and whether any species present in solution can react with the additives.
Select all that apply.
Group of answer choices:
a. Na2CO3
b. HCl
c. NaHSO4

HCl

Explanation:

calcium carbonate dissolves in HCl acid producing CO 2 gas. It will not dissolve in pure water. The Ksp for calcium carbonate in water is 3.4 x 10-9 moldm-3 which is very low. What takes place here is actually a chemical reaction:

CaCO 3 (s) + 2HCl(aq) → CaCl 2 (aq) + H 2CO 3(aq)

This reaction accounts for the solubility of the Calcium carbonate in HCl and not in pure water.

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