The limiting molar conductivity of La³⁺ and Cl⁻ions in aqueous medium at 298 K are 209.10 × 10⁻⁴ and 76.35 ×… · ABC26PH0703

Subject: Physical Chemistry · Chapter: Electrochemistry · Topic: Conductance · Exam: JAM 2001-2022 · Marks: 2 · Difficulty: Medium

The limiting molar conductivity of $\mathrm{La}^{3+}$ and $\mathrm{Cl}^{-}$ions in aqueous medium at 298 K are $209.10 \times 10^{-4}$ and 76.35 $\times 10^{-4} \mathrm{S} \mathrm{m}^{2} \mathrm{mol}^{-1}$, respectively. The transport number of $\mathrm{Cl}^{-}$in an infinitely dilute aqueous solution of $\mathrm{LaCl}_{3}$ at 298 K is ____ (Round off to two decimal places).
Answer
SELF-PRACTICE — the source book printed no answer.

Nothing is invented here, so this question has no answer on record.

Explanation
Answer: t(Cl⁻) ≈ 0.52 — t₋ = 3λ(Cl⁻)/[λ(La³⁺) + 3λ(Cl⁻)] = 229.05/438.15 = 0.52.

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