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Solubility Product

Calculate the...

Question

Calculate the pH of a $0.02 M$ aqueous solution of ${N H}_{4} O H$ .
Given, $p K_{{N H}_{4} O H} = 4.73$

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Solution

$N H_{4} O H$ is weak base so
$p O H = 0.5 (p K_{b} - l o g C)$
$p O H = 0.5 (4.73 - l o g (0.02))$
$p O H = 0.5 (4.73 + 1.69)$
$p O H = 3.21$
As we know $p H + p O H = 14$
So $p H = 9.79$

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