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pH the Power of H

1L of a buffe...

Question

1L of a buffer is created to be $0.100 M$ in $H O A c$ . the $p K_{a} = 4.7$ and $0.100 M$ in $N a O A c$ . What is the $p H$ ?

6.7

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4.7

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1.7

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5.7

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Solution

The correct option is B 4.7
Given, $p K_{a}$ for $H O A c$ is 4.7 $[H O A c] = 0.100 M, [N a O A c] = 0.100 M$
Using the Henderson-Hasselbalch equation for weak acid:
$p H = p K_{a} + l o g [\frac{[s a l t]}{[a c i d]}]$
$p H = p K_{a} + l o g [\frac{[N a O A c]}{[H O A c]}]$
$p H = 4.7 + l o g (\frac{0.100 M}{0.100 M})$
$p H = 4.7$

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