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IM NH4 OH and JMHCl are mixed to make...

IM ` NH_4 OH ` and JMHCl are mixed to make total volume of 300 mL. If pH of the mixture is 9.26 and ` pK_a (NH_4 ^(+)) = 9.26 ` then volume ratio of `NH_4` and HCl will be :

A

`1:1`

B

` 1: 2`

C

` 2: 1`

D

`3:1`

Text Solution

Verified by Experts

The correct Answer is:
C
If volume of `NH_4OH ` = xml
then HCl = ` ( 300 -x ) ml`
pH of mixture = ` pKa of NH_4^(+) `
`rArr " buffer with " [S] =[B]`
` 1 xx ( 300 - x) = ( 1 xx x ) - ( 300 -x ) `
` rArr x = ( 600)/( 3 ) = 200 rArr " ratio " =(200)/(100) = (2)/(1) `
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