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Basic Buffer Action

Calculate the...

Question

Calculate the pH of the buffer containing $1.0 m o l L^{- 1}$ of weak acid HA and $0.1 m o l L^{- 1}$ of is sodium salt $N a A$ assuming $K_{a}$ to be $10^{- 6}$ .

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Solution

$p H = p K_{a} + l o g \frac{[c o n j u g a t e b a s e]}{[w e a k a c i d]}$
$p H = (- l o g K_{a}) + l o g \frac{[0.1]}{[1.0]}$
$p H = - l o g (10^{- 6}) + l o g (0.1)$
$p H = 6 - 1 = 5$

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