QuestionElectrochemistry / moving boundary
In a moving boundary experiment with 0.01 mole LiCl, the boundary in a tube with cross sectional area of 0.125 cm² moves through 8.1 cm in 1500 sec for a current of 1.8 × 10⁻³ ampere. What will be the value of transport number of Cl⁻? (Given that F = 96,500 Coulomb and temperature is 300K)
- (a) 0.639
- (b) 0.361
- (c) 0.510
- (d) 0.369
Answer: (a) 0.639
The boundary measures the cation: t(Li⁺) = cFAl/(It) = (1 × 10⁻⁵ mol cm⁻³ × 96500 × 0.125 × 8.1)/(1.8 × 10⁻³ × 1500) = 0.362. t(Cl⁻) = 1 − 0.362 = 0.638 ≈ 0.639 → (a).