Q.

The molar conductivity of 0.007 M acetic acid is 20 S cm2 mol-1. What is the dissociation constant of acetic acid? Choose the correct option.
H+0=350 S cm2 mol1CH3COO0=50 S cm2 mol1

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a

2.50 x 10-5 mol L-1

b

1.75 x 10-5 mol L-1

c

1.75 x 10-4 mol L-1

d

2.50 x 10-4 mol L-1

answer is D.

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Detailed Solution

Degree of dissociation (α) of CH3COOH
=ΛCΛ0=20350+50=120Ka=21α1α1Ka=2Ka=0.007×120×120Ka=1.75×105

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