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The pH value of decinormal solution of N...

The pH value of decinormal solution of NH4OH, which is 20% ionised, is:

A

12.95

B

12.3

C

14.7

D

13.3

Text Solution

Verified by Experts

The correct Answer is:
B
Concentration of `NH_(4)OH` solution =0.1 N
Concentration of `OH^(-)` ions in solution,
`[OH^(-)]=20% " of " 0.1 N =(20)/(100)xx0.1
=0.02 N
`implies pOH =-log[OH^(-)]=-log (0.02)
`=2-0.301`
`implies pH=14-pOH=12.30`
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