Besides temperature, ionic strength, and common ion effect, the pH of a solution can also have a large impact on

Besides temperature, ionic strength, and common ion effect, the pH of a solution can also have a large impact on solubility whenever one (or both) of the dissociated ions from a solid can act as a weak acid/base. Consider the series of simultaneous equilibria shown below (you can assume all species are aqueous unless otherwise noted):

CaF2(s) ⇌ Ca2++ 2F-Ca2++ F-⇌ CaF+CaF2(s) ⇌ CaF2(aq)Ca2++ H2O ⇌ CaOH++ H+F -+ H+ ⇌ HF HF + F- ⇌ HF2-H2O ⇌ H+ + OH- (a) Write the charge-balance expression for this system. (b) Write the mass-balance expressions for this system.


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