For which salt should the aqueous solubility be most sensitive to ph?

The salt that its aqueous solubility most sensitive to pH would be calcium fluoride (CaF2). It is an insoluble salt which when reacted with an acid, it yields this equation: 

CaF2 (s) + 2 HX (aq) → 2 HF (aq) + CaX2 (aq)

Since it produces H+ and and OH- when combined with water, it is therefore sensitive to pH.

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