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Equilibrium constant for the following r...

Equilibrium constant for the following reaction is `1xx10^(-9)` :
`C_(5)H_(5)N(aq.)+H_(2)O(l)hArrC_(5)H_(5)NH^(+)(aq.)+OH^(-)(aq.)`
Determine the moles of pyridinium chloride `(C_(5)H_(5)N)` to obtain a buffer solution of pH=5 :

A

`0.1` mole

B

`0.2` mole

C

`0.3` mole

D

`0.4` mole

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