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Basic Buffer Action

The pH of a...

Question

The $p H$ of a buffer solution is 5. $p K a$ of the acid present in it is 4. What is the ratio of acid and salt present in the solution?

1:1

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1:10

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10:1

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1 :2

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Solution

The correct option is B 10:1
The expression for the pH of the acidic buffer solution is as given below.
$p H = p K a + l o g \frac{[S a l t]}{[A c i d]}$
$p K a = 4$
$p H = 5$
Substitute values in the above equation.
$5 = 4 + l o g \frac{[S a l t]}{[A c i d]}$
Hence, $[S a l t] : [A c i d] = 10 : 1$ .

Option C is correct.

Suggest Corrections

Similar questions

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

p K_{a}

4.8

5.8

p^{H}

5

H A

A^{-}

P^{K a}

H A

4.699

H A

A^{-}

p K_{a}

4.8

p H = 5.8

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