Question

How many moles of `NaOH` must be removed from 1 litre of aqueous solution to change its `pH` from 12 to 11
A. `0.009`
B. `0.01`
C. `0.02`
D. `0.1`

Answer 1

Correct Answer - 1
`{:("Initial "pH=12,,pOH=2,,,[OH^(-)]=10^(-2),),("Final "pH=11,,pOH =3,,,[OH^(-)]=10^(-3),):}`
Moles of `NaOH` removed `=0.01-0.001=0.009." "Ans.(1)`