Chemical and Ionic Equilibrium - Result Question 118
62. Calculate the $pH$ of an aqueous solution of $1.0 M$ ammonium formate assuming complete dissociation.
$\left(p K _a\right.$ of formic acid $=3.8$ and $p K _b$ of ammonia $\left.=4.8\right)$
(1995, 2M)
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Answer:
Correct Answer: 62. $(6.50)$
Solution:
- For salts of weak acid and weak base .
$pH=7+\frac{1}{2}\left(p K _a-p K _b\right)=7+\frac{1}{2}(3.8-4.8)=6.50$
BETA
