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Q.

A buffer solution contains 0.2mole of ${NH}_{4} OH$ and 0.2mole of ${NH}_{4} Cl$ per litre. The ${pK}_{b}$ of ${NH}_{4} OH$ is 4.75. Calculate the $pH$ of the buffer.

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answer is 9.25.

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Detailed Solution

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$p^{OH} = p^{Kb} + \log \frac{(B)}{(B)} = 4.75 + \log \frac{0.2}{0.2} = 4.75$

$p^{H} = 14 - 4.75 = 9.25$

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A buffer solution contains 0.2mole of NH4OH and 0.2mole of NH4Cl per litre. The pKb of NH4OH is 4.75. Calculate the pH of the buffer.