87.1 Electrolyte and electrolytic solution 8. Transference number (1) Principle of Hittorf method(1853) Example: Electrolysis of HCl ⊙④ SolutIon IF anodic region bulk solution cathodic region When 4 Faraday pass through the electrolytic cell 4CI-4e→ 3 mol H 3 mole 4I++4e 2C2个 I mol cl 2H final result For anodic region: residual reacted t C transfered anodic region bulk solution cathodic region(1) Principle of Hittorf method (1853) Example: Electrolysis of HCl solution When 4 Faraday pass through the electrolytic cell anodic region bulk solution cathodic region + + + + + + + + + + + + + + + + + + − − − − − − − − − − − − − − − − − − + = 1 F + + + + + + + + + + + + + + + + + + − − − − − − − − − − − − − − − − − − 4Cl- -4e- → 2Cl2 4H+ +4e- → 2H2 3 mol H+→ 1 mol Cl-  3 mol H+→ 1 mol Cl-  8. Transference number anodic region bulk solution cathodic region + + + + + + + + + + + + + + − − − − − − − − − − − − − − final result For anodic region: residual initial reacted transfered c = c −c + c §7.1 Electrolyte and electrolytic solution