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The K(a) for formic acid and acetic acid...

The `K_(a)` for formic acid and acetic acid are `2xx10^(-4)` and `2xx10^(-5)` respectively. Calculate the relative strength of acids with same molar concentration

A

`sqrt10`

B

`sqrt7`

C

`sqrt8`

D

`sqrt5`

Text Solution

Verified by Experts

The correct Answer is:
A
Relative strength of weak acids `=sqrt(((K_(a_(1)))/(K_(a_(2)))xxC_(1)/C_(2)))`
Relative strength `=sqrt(((K_(a_(1)))/(K_(a_(2))))) (? C_(1)=C_(2))`
`=sqrt(((2xx10^(-4))/(2 xx 10^(-5))))=sqrt10:1`
Relative strength for HCOOH to `CH_(3)COOH =sqrt10:1`
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