Why does pH affect the solubility of BaF2 but not that of BaCl2

Question

 Just a brief explanation. 

Answer 1

BaF₂ dissociates into Ba²⁺(aq) and 2F-(aq).

 

If you consider F^- (aq), it's the conjugate base of the weak acid, hydrofluoric acid (HF). Keeping LeChatlier's Principle in mind, the concentration of the dissolved fluoride ion affects the dissolution of:

 

HF (aq) --> H⁺(aq) + F^- (aq)