(C) The $pH$ of a salt solution formed from a weak acid and a weak base (e.g.,$CH_3COONH_4$) is given by the formula: $pH = 7 + \frac{1}{2}pK_a - \fra

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(C) The $pH$ of a salt solution formed from a weak acid and a weak base (e.g.,$CH_3COONH_4$) is given by the formula: $pH = 7 + \frac{1}{2}pK_a - \frac{1}{2}pK_b$ Since this expression does not contain any concentration term,the $pH$ of such a salt solution is independent of dilution. Therefore,the $pH$ remains constant.