13.2 Exercise 4

Among the solubility rules previously discussed is the statement: All chlorides are soluble except Hg₂Cl₂, AgCl, PbCl₂, and CuCl.

(a) Write the expression for the equilibrium constant for the reaction represented by the equation $\text{AgCl} \left(s\right) \rightleftharpoons \text{Ag}^{+} \left(a q\right) + \text{Cl}^{−} \left(a q\right) .$ Is K_c > 1, < 1, or ≈ 1? Explain your answer.

(b) Write the expression for the equilibrium constant for the reaction represented by the equation $\text{Pb}^{2+} \left(a q\right) + 2 \text{Cl}^{−} \left(a q\right) \rightleftharpoons \text{PbCl}_{2} \left(s\right) .$ Is K_c > 1, < 1, or ≈ 1? Explain your answer.