Ionic EquilibriumMedium
Question
The pH of an aqueous solution of 1.0 M ammonium formate assuming complete dissociation is (pKa of formic acid = 3.8 and pKb of ammonia = 4.8)
Options
A.7.0
B.7.5
C.6.5
D.4.3
Solution
$P^{H} = 7 + \frac{1}{2}\left( P^{K_{a}} - P^{K_{b}} \right) = 7 + \frac{1}{2}(3.8 - 4.8) = 6.5$
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