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The percentage of pyridine (C(5)H(5)N) t...

The percentage of pyridine `(C_(5)H_(5)N)` that forms pyridinium ion `(C_(5)H_(5)N^(+)H)` in a 0.10 M aqueous pyridine solution (`K_(b)` for `C_(5)H_(5)N=1.7xx10^(-9)`) is

A

0.0077

B

0.016

C

6.0E-5

D

0.00013

Text Solution

Verified by Experts

The correct Answer is:
D
Pyrimidine is a very weak base so `K_b=c alpha^2`
`alpha=sqrt((K_b)/(c))`
`=sqrt((1.7xx10^(-9))/(0.9))`
`=1.3xx10^(-4)`
`%alpha=0.013%`
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