The pH and conductance of a weak acid (HX) was found to be 5 and 4 × 10 –5 S, respectively. The conductance was measured under standard condition using a cell where the electrode plates having a surfa

Question

The pH and conductance of a weak acid (HX) was found to be 5 and 4 × 10 –5 S, respectively. The conductance was measured under standard condition using a cell where the electrode plates having a surface area of 1 cm 2 were at a distance of 15 cm apart. The value of the limiting molar conductivity is ……….. S m 2 mol –1. (nearest integer) (Given: degree of dissociation of the weak acid (a) << 1)

Prashant Kotian · Accepted Answer

Correct answer: .. pH = 5 [H +] = 10 –5 = [HX]. m m [HX].     m k 1000 [HX]    K = G.G * = 15 4 10    = 6× 10 –4 S.cm –1 5 m 6 10 [H ] [HX] [HX]           m  = 60000 S.cm 2 mol -1 m  = 6 S.m 2 mol -1 ALLEN 8 JEE-Main Exam Session-1 (January 2026)/21- 

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