The of a weak acid, , is . The of a weak base, , is . What will be the exact pH of an aqueous solution of the corresponding salt, , at standard temperature?

Question

The $pK_a$ of a weak acid, $HA$, is $4.80$. The $pK_b$ of a weak base, $BOH$, is $4.78$. What will be the exact pH of an aqueous solution of the corresponding salt, $BA$, at standard temperature?

Prashant Kotian · Accepted Answer

Correct answer: A. The salt is formed from a weak acid and a weak base. The formula for the pH of a WA-WB salt solution is independent of concentration: . Substituting the given values: .

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