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Dissolution of Solids and Gases in Liquid

PK a values o...

Question

$p K_{a}$ values of two acids A and B are 4 and 5. The strengths of these two

acids are related as

A

Acid A is 10 times stronger than acids B

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B

Strength of acid A : strengtha of acid B = 4 : 5

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C

The strengths of the two acids can not be compared

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D

Acid B is 10 times stronger than acid A

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Solution

The correct option is A
Acid A is 10 times stronger than acids B

$p K_{a}$ of acid A = 4; $p K_{b}$ of acid B =

We know that $p K_{a}$ = $- l o g K_{a}$

$∴$ Acid A $K_{a}$ = $10^{- 4}$

$∴$ Acid B $K_{b}$ = $10^{- 5}$

Hence A is ten times stronger than that of B

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