IGNOU BCHET 141 2026 - From the following data, calculate the molar conductivity of NaC

Question

From the following data, calculate the molar conductivity of NaCl in aqueous solution:

Conductivity of 4.0 × 10^-4mol dm^-3 NaCl solution = 6.20 × 10^-3S m⁻¹

Conductivity of the water = 0.05 × 10^-3 S m⁻¹.

10 Jan 2026

Answer :

Word Count : 260

The molar conductivity of an electrolyte is obtained from the measured conductivity after correcting for the contribution of the solvent and relating it to the concentration of the solution. In the present case, the specific conductivity of the aqueous sodium chloride solution is given as 6.20 × 10⁻³ S m⁻¹, while pure water shows a conductivity of 0.05 × 10⁻³ S m⁻¹ due to the presence of dissolved gases and self-ionization. For accurate analytical measurement, this background conductivity must be subtracted from the observed value. Hence, the corrected conductivity of the NaCl solution is (6.20 − 0.05) × 10⁻³ S m⁻¹,

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