Question

(a) E° (Cu²⁺/Cu) and Eo (Ag⁺/Ag) is + 0.337 V and +0.799 V respectively. Make a cell whose EMF is +ve. If the concentration of Cu²⁺ 0.01M and E cell at 25°C is concentration of Ag⁺

(b) Calculate the potential of the cell at 298 K: Cd/Cd²⁺ (0.1M)|| H⁺(0.2M)/Pt, H (0.5 atm) 2 Given Eo for Cd²⁺/Cd = 0.403 V, R = 8.314 J^-1 mol F = 96500 C mol^-1 

Answer 1

(a) Cu is more reactive than silver, so that the cell is as

Cu/Cu²⁺ (0.01M)||Ag⁺(C)/Ag or cell reaction 

Cu + 2Ag ⁺ → Cu²⁺ + 2Ag 

E∞H = F 

(b) The cell reaction is Cd + 2H⁺ (0.2m) → Cd²⁺ (0.1M) + H (0.5 atm)