Among the solubility rules previously discussed is the statement: Carbonates, phosphates, borates, and arsenates-except those of the ammonium ion and the alkali metals-are insoluble.
(a) Write the expression for the equilibrium constant for the reaction represented by the equation
CaCO3(s) ? Ca2+(aq) + CO3 -(aq). Is Kc > 1, < 1, or ≈ 1? Explain your answer