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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