Calcium carbonate is relatively insoluble and the dissolution reaction is endothermic: CaCO₃(s) ⇌ Ca²⁺(aq) + CO₃^2-(aq) .
Which change in reaction condition below will shift the equilibrium to the right?

Question

Quizplus · Accepted Answer

Adding an acid will react with the carbonate ion, reducing its concentration and shifting the equilibrium to the right according to Le Chatelier's principle. Adding an anion that forms a less soluble compound with calcium will remove calcium ions from the solution, also shifting the equilibrium to the right. Increasing the temperature will favor the endothermic dissolution process, again shifting the equilibrium to the right.

Calcium Carbonate Is Relatively Insoluble and the Dissolution Reaction Is