The $p^{k a}$ of a certain weak acid is 4.0 what should be the [salt] to [acid] ratio if we have to prepare a buffer with $p H = 5$ using the acid and one of the salts?
(1992)

4:5

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5:4

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10:1

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1:10

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Solution

The correct option is C 10:1
The expression for the pH of the acidic buffer solution is as given below.
$p H = p K_{a} + l o g \frac{[S a l t]}{[A c i d]}$
$p K_{a} = 4.0$
Substitute values in the above equation.
$5.0 = 4.0 + l o g \frac{[S a l t]}{[A c i d]}$
Hence, $\frac{[S a l t]}{[A c i d]} = \frac{10}{1} = 10 : 1$ .

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The pka of a certain weak acid is 4.0 what should be the [salt] to [acid] ratio if we have to prepare a buffer with pH=5 using the acid and one of the salts?(1992)

The correct option is C 10:1The expression for the pH of the acidic buffer solution is as given below.pH=pKa+log[Salt][Acid]pKa=4.0Substitute values in the above equation.5.0=4.0+log[Salt][Acid]Hence, [Salt][Acid]=101=10:1.

The $p^{k a}$ of a certain weak acid is 4.0 what should be the [salt] to [acid] ratio if we have to prepare a buffer with $p H = 5$ using the acid and one of the salts?
(1992)