\( p K_{a} \) of a weak acid \( (\mathrm{HA}) \) and \( \mathrm{pK}_{\mathrm{b}} \) of a weak ba...

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\( p K_{a} \) of a weak acid \( (\mathrm{HA}) \) and \( \mathrm{pK}_{\mathrm{b}} \) of a weak base \( (\mathrm{BOH}) \) are \( 3.2 \) and \( 3.4 \), respectively. The \( \mathrm{pH} \) of their salt \( (A B) \) solution is :
(1) \( 6.9 \)
(2) \( 7.0 \)
(3) \( 1.0 \)
(4) \( 7.2 \)
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