AP Chemistry
7.12 Common-Ion Effect
7.11 Introduction to Solubility Equilibria
7.10 Reaction Quotient and Le Châtelier’s Principle
A saturated aqueous solution of calcium fluoride is in dynamic equilibrium with excess solid \(\text{CaF}_2\) at \(25\ ^\circ\text{C}\), as represented by the equation below:
\[ \text{CaF}_2(s) \rightleftharpoons \text{Ca}^{2+}(aq) + 2\,\text{F}^-(aq) \]
A small amount of solid \(\text{NaF}\) is added to the mixture with thorough stirring and dissolves completely without significantly changing the volume of the solution. Which of the following statements correctly predicts and explains the effect on \([\text{Ca}^{2+}]\) once dynamic equilibrium is re-established at \(25\ ^\circ\text{C}\)?
\[ \text{CaF}_2(s) \rightleftharpoons \text{Ca}^{2+}(aq) + 2\,\text{F}^-(aq) \]
A small amount of solid \(\text{NaF}\) is added to the mixture with thorough stirring and dissolves completely without significantly changing the volume of the solution. Which of the following statements correctly predicts and explains the effect on \([\text{Ca}^{2+}]\) once dynamic equilibrium is re-established at \(25\ ^\circ\text{C}\)?
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