Question

When a certain conductance cell as filled with 0.1 M KCl, it has a resistance of 85 ohm at 25°C. When the same cell was filled with an aqueous solution of 0.052 M unknown electrolyte, the resistance was 96 ohms. Calculate the molar conductance of the electrolyte at this concentration.

[Specific conductance of 0.1 M KCl = 1.29 x 10² ohm^-1 cm^-1]

Answer 1

Calculation of cell constant 

Conductivity of 0.1 M KCl = 1.29 x 10^-2 Ω^-1 cm^-1 

 Resistance = 85 ohm

Conductivity,

Conductivity of unknown electrolyte K,