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Basic Buffer Action

Calculate the...

Question

Calculate the pH of the buffer solution containing $0.15 m o l e$ of ${N H}_{4} O H$ and $0.25 m o l e$ of ${N H}_{4} C l$ . $K_{b}$ for ${N H}_{4} O H$ is $1.8 \times 10^{- 5}$

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Solution

Applying the equation
$p O H = log \frac{[S a l t]}{[B a s e]} - log K_{b}$
$= log \frac{0.25}{0.15} - log 1.8 \times 10^{- 5} = 4.966$
$p H = (14 - 4.966) = 9.034$

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