Question

The molar conductivity of a weak electrolyte when plotted against the square root of its concentration, which of the following is expected to be observed?

• A. A small decrease in molar conductivity is observed at infinite dilution.
• B. A small increase in molar conductivity is observed at infinite dilution.
• C. Molar conductivity increases sharply with increase in concentration.
• D. Molar conductivity decreases sharply with increase in concentration.

Hint:

At infinite dilution, the molar conductivity of weak electrolytes approaches a limiting value due to the complete dissociation of ions.

Answer 1

The Correct Option is A

- For weak electrolytes, the molar conductivity increases with decreasing concentration, but at very low concentrations (infinite dilution), the increase becomes less significant and approaches a limiting value.
- Therefore, a small decrease in molar conductivity is observed as the concentration approaches zero. Thus, the correct answer is a small decrease in molar conductivity at infinite dilution.