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Question

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

A
6.9
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B
7.0
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C
1.0
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D
7.2
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Solution

The correct option is D 6.9
We know,

pH=12(pKw+pKapKb)
pH=12(14+3.23.4)
pH=12(13.8)
pH=6.9
Hence, the option (A) is the correct answer.

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