When a salt of a weak acid and a weak base is | vedclass

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Question

(D) For a salt of a weak acid $(WA)$ and a weak base $(WB)$,the $pH$ of the solution is given by the formula: $pH = 7 + \frac{1}{2} pK_a - \frac{1}{2}

Vedclass · Accepted Answer

Depend upon $K_a$ and $K_b$ values

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(D) For a salt of a weak acid $(WA)$ and a weak base $(WB)$,the $pH$ of the solution is given by the formula: $pH = 7 + \frac{1}{2} pK_a - \frac{1}{2} pK_b$. Since the $pH$ depends on the relative values of $pK_a$ and $pK_b$,it can be equal to,greater than,or less than $7$ depending on whether $K_a = K_b$,$K_a  K_b$ respectively. Therefore,the $pH$ depends upon the $K_a$ and $K_b$ values.

When a salt of a weak acid and a weak base is dissolved in water at $25\,^{\circ}C$,the $pH$ of the resulting solution will always :-

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