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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

`0.05 "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) xx 10^(0.699)`
`= 5 xx 10^(-2) M`
`= 0.05 M`
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