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Q.

The pH of an aqueous solution of 1.0 M ammonium formate assuming complete dissociation is (pKa for formic acid = 3.8 and pKb of Ammonia  aqueous solution= 4.8)

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a

4.6

b

6.5

c

7.6

d

8.4

answer is B.

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Detailed Solution

Ammonium formate is a salt of weak acid and weak base.Hence pH=7+12pKa−12pKb=7+12(3.8)−12(4.8)= 6.5
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The pH of an aqueous solution of 1.0 M ammonium formate assuming complete dissociation is (pKa for formic acid = 3.8 and pKb of Ammonia  aqueous solution= 4.8)