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If pK(b) for fluoride ion at 25^(@)C is ...

If `pK_(b)` for fluoride ion at `25^(@)C` is `10.83`, the ionization constant of hydrofluroic acid in water at this temparature is

A

`1.74xx10^(-5)`

B

`3.52xx10^(-3)`

C

`6.95xx10^(-4)`

D

`5.38xx10^(-2)`

Text Solution

Verified by Experts

The correct Answer is:
C
`{:(HF+H_(2)O,hArr,F^(+)+H_(3)O^(+)),(K_(a)xxK_(b)=k_(w),,pK_(a)+pK_(b)=pK_(w)):}`
`pK_(a)=14-10.83 implies pK_(a)=3.17`
`K_(a)=6.75xx10^(-4)`
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