QJEEM17Ch109c: JEE Main 2017 Chemistry - Class 11 JEEM17Ch109c Solution: pK a of a weak acid (HA) and pK b of a weak base (BOH) are 3.2…

Question

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pK_a of a weak acid (HA) and pK_b of a weak base (BOH) are 3.2 and 3.4, respectively. The pH of their salt (AB) solution is :

Accepted Answer

The salt (AB) given is a salt is of weak acid and weak base. Hence its pH can be calculated by the formula

∴

pH = 7 +

\frac{1}{2} p K_{a} - \frac{1}{2} p K_{b}

= 7 +

\frac{1}{2} (3.2) - \frac{1}{2} (3.4)

= 6.9

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