When acid ($ ext{H}^+$) is added to calcium fluoride ($ ext{CaF}_2$), what primarily happens to the fluoride ions ($ ext{F}^-$)?
Answer
They react with $ ext{H}^+$ to form hydrofluoric acid ($ ext{HF}$).
The fluoride ion ($ ext{F}^-$) is the conjugate base of the weak acid $ ext{HF}$. The added acid protonates this anion, consuming it from the dissolution equilibrium and forcing more $ ext{CaF}_2$ to dissolve to maintain $K_{sp}$.
Related Questions
What general condition must be met for the pH of a solution to significantly alter a salt's solubility?How is the solubility of sodium chloride ($ ext{NaCl}$) affected by changes in the solution's $ ext{pH}$?When acid ($ ext{H}^+$) is added to calcium fluoride ($ ext{CaF}_2$), what primarily happens to the fluoride ions ($ ext{F}^-$)?For a salt containing an anion that is the conjugate base of a weak acid, what drives increased dissolution upon lowering the $ ext{pH}$?In a basic solution, how does the solubility of ammonium chloride ($ ext{NH}_4 ext{Cl}$) increase?What characteristic describes the solubility curve of metal hydroxides that exhibit amphoterism when solubility is plotted against $ ext{pH}$?Which metal hydroxides are explicitly named as common examples of amphoteric substances?At low $ ext{pH}$, how does the dissolution of an amphoteric hydroxide like $ ext{Al}( ext{OH})_3$ proceed?What is the mechanism causing increased solubility of amphoteric hydroxides in highly basic solutions (high $ ext{pH}$)?If $ ext{Salt A}$ ($ ext{MCl}$) and $ ext{Salt B}$ ($ ext{MF}$) share the same $K_{sp}$, how does their solubility compare in an acidic $ ext{pH}$ environment?