First slide

PH of strong acids and strong bases

Question

One litre of a buffer solution containing 0.01 M ${NH}_{4} Cl$ and 0.1 M ${NH}_{4} OH$ having ${pK}_{b}$ of 5 has pH of

Moderate

A

9
B

10
C

6
D

7

Solution

$pOH = {pK}_{b} + \log \frac{[salt]}{[base]}$
$= 5 + \log \frac{0.01}{0.1} = 5 + \log 10^{- 1}$
= 5-1 = 4
$∴ pH = 14 - 4 = 10$

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