Question

20) Electrochemical cell potentials can be used to determine equilibrium constants that would be otherwise difficult to determine because concentrations are small. Calculate the value of Ksp for CdS at 298K from the following data.

CdS(s) + 2 e− → Cd(s) + S^2-(aq) E° = −1.21 V

Cd²⁺(aq) + 2 e− → Cd(s)   E° = −0.40 V

A) 7.8 × 10^-12

B) 2.6 × 10²⁷

C) 3.9 × 10^-28

D) 3.2 × 10¹⁸

Answer 1