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The pH of mono-acidic base 12.6990. The ...

The pH of mono-acidic base `12.6990`. The molarity of the base is

A

0.02 moles/litre

B

0.05 moles/litre

C

0.5 moles/litre

D

0.2 moles/litre

Text Solution

Verified by Experts

The correct Answer is:
B
`p^(H)=12.699" "p^(OH)=1.3010`
`[O^(-)H]=10^(-1.3010)=10^(-2)xx10^(0.699)`
`=5xx10^(-2)M=0.05M`
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