Redox Reactions And Electrochemistry Ques 639

Question: Specific conductance of 0.1 MHA is 3.75×104ohm1cm1 . If λ(HA)=250,ohm1cm2mol1 , the dissociation constant Ka of HA is:

Options:

A) 1.0×105

B) 2.25×104

C) 2.25×105

D) 2.25×1013

Show Answer

Answer:

Correct Answer: C

Solution:

[c] λm=1000κ0.1=1000×3.75×1040.1=3.75;

α=λmλm=3.75250=1.5×102 ;

Ka=Cα2=0.1×(1.5×102)2=2.25×105



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