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Introduction and Degree of Hydrolysis

An aqueous so...

Question

An aqueous solution at room temperature is $0.1 M$ with respect to ammonium chloride and $0.1 M$ with respect to $N H_{4} O H (p K_{b} = 5)$ , the $p H$ of the solution is:

7.5

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6.8

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6.5

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9.0

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Solution

The correct option is C $9.0$
A basic buffer solution is formed which contains a weak base (ammonium hydroxide) and its salt (ammonium chloride) with a strong acid (HCl).
$p H = 14 - p K_{b} - l o g \frac{[N H_{4} C l]}{[N H_{4} O H]}$
$p H = 14 - 5 - l o g \frac{0.1 M}{0.1 M}$
$p H = 9.0$

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