What is the equilibrium constant expression for dissolving calcium carbonate in water?

Equation for dissolving calcium carbonate in water:
CaCO3(s) ⇄ Ca²⁺(aq) + CO₃²⁻(aq).
The equilibrium constant expression for this reaction: K = [Ca²⁺] [CO₃²⁻] / [CaCO3(s)], but concentration of CaCO3(s) is 1 (for all solid), so  the simpler expression for the equilibrium constant is:K = [Ca²⁺] [CO₃²⁻].

☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts