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If the pH of a mixture of 10 ml of 0.1 M NH4OH and 10 ml of NH4Cl solution is 8, the pKb value of NH4OH is then closest to a)3 b)5 c)7 d)9

If the pH of a mixture of 10 ml of 0.1 M NH4OH and 10 ml of NH4Cl solution is 8, the pKb value of NH4OH is then closest to


a)3   b)5   c)7   d)9

Grade:12

1 Answers

vikas askiitian expert
509 Points
11 years ago

in aqueous solution

NH4OH   ---->  NH4+ + OH-

NH4Cl  --------->  NH4+ + cl-

 Kb for NH4OH = [NH4+][OH-] /NH4OH

here common ion effect is observed ....

 Kb = [NH4Cl][OH-]/NH4OH

     =[OH-]                                     (NH4Cl =NH4OH)

H+ = 10-8                   (given)

OH- =Kw/H+ =10-6

Kb = 10-6

Pkb =6

 

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