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Basic Buffer Action

The pH of a...

Question

The $p H$ of a buffer solution is 4. The $p K a$ of the acid in it is 4.301. The ratio of salt and acid present in the buffer solution is:

1 : 1

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1 : 2

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2 : 1

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1 : 5

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Solution

The correct option is B $1 : 2$
The expression for the pH of the acidic buffer solution is as given below.
$p H = p K_{a} + l o g \frac{[S a l t]}{[A c i d]}$
$p K_{a} = 4$
$p H = 4.301$
Substitute values in the above equation.
$4 = 4.301 + l o g \frac{[S a l t]}{[A c i d]}$ .
Hence, $[S a l t] : [A c i d] = 1 : 2$ .

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Similar questions

A

x : y

p H = (p H)

B

y : x

p H = (p H)_{2}

(p H)_{2} - (p H)_{1} = 1

(p H)_{1} + (p H)_{2} = 9.5 u n i t s

5

p H

1

2

P^{K a} = p^{H}

[S a l t] = [A c i d]

P^{K a} = 7

[H +]

P^{K a}

p H

p H = p K_{a} + log \frac{[S a l t]}{[A c i d]}

K_{a}

= 1.8 \times 10^{- 5}

= 0.1 M

p H

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