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Question

0.25 M solution of pyridine chloride C5H6N+Cl was found to have a pH of 2.699. What is Kb for pyridine, C5H5N?(log2=0.3010)

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Solution

For a salt of weal base and strong acid,
pH=712pKb12logc
Where C is the concentration of the salt.
C5H6N+Ce is the salt given
C5H6N+Ce+H2OC5H6NOH+HCe
C5H6NOHC5H5N+H2O
Given,
pH=2.699
C=0.25M
2.699=712pKb12log(0.25)
12pKb=4.602
pKb=9.204
log[Kb]=9.204
Kb=6.25×1010

1051239_1177865_ans_c6b818390485492a9944d5499ca43618.png

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