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Solubility Product

pH of a solut...

Question

$p H$ of a solution containing 0.01 M $N H_{4} C l$ and 0.1 M $N H_{4} O H$ solution is:
[Given: $p K_{b}$ = 5]

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Solution

The correct option is B 10
Given:
$N H_{4} C l \to 0.01 M N H_{4} O H \to 0.1 M p K_{b} = 5$

$p O H = p k_{b} + l o g \frac{[s a l t]}{[B a s e]} p O H = 5 + l o g \frac{[0.01]}{[0.1]} p O H = 5 + l o g 10^{- 1} = 5 - 1 = 4$
$p H = 14 - p O H = 14 - 4 = 10$

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