Question 17.11: The Effect of pH on Solubility Determine whether each compou...

The Effect of pH on Solubility
Determine whether each compound is more soluble in an acidic solution than in a neutral solution.
(a) BaF_2               (b)AgI                          (c) Ca(OH)_2

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(a) BaF_2 is more soluble in acidic solution because the F^- ion is a weak base. (F^- is the conjugate base of the weak acid HF and is therefore a weak base.)
(b) The solubility of AgI is not greater in acidic solution because the I^-  is not a base. (I^- is the conjugate base of the strong acid HI and is therefore pH^-neutral.)
(c) Ca(OH)_2 is more soluble in acidic solution because the OH^- ion is a strong base.

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