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If pK(b) for floride at 25^(0)C is 11, t...

If `pK_(b)` for floride at `25^(0)C` is `11`, the ionisation constant of hydrofluoric acid in water at this temperature is

A

`10^(-3)`

B

`10^(-4)`

C

`10^(-2)`

D

`10^(-5)`

Text Solution

Verified by Experts

The correct Answer is:
A
`K_(w) = K_(a)xxK_(b) , K_(a) = (K_(w))/(K_(b))`
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