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The volume of water that must be added t...

The volume of water that must be added to `100 ml` of `NaOH` solution to change its pH value from `12.6990` to `12` is

A

500 mL

B

400 mL

C

100 mL

D

200 mL

Text Solution

Verified by Experts

The correct Answer is:
B
`(i)pH=12.699,[OH^(-)]=5x10^(-2)`
`pOH=1.3010`
(ii) `pH=12, pOH=2, [OH^(-)]=5x10^(-2)`
`100x5x10^(-2)=10^(-2)xV`
`V=500`
Volume of water added `=500-100=400 ml`
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