Question

The standard electrode potentials are Zn +2 / Zn = -0.76 V , Fe +2 / Fe = - 0.44 V , H + / H 2 = 0 V &
Cu +2 / Cu = 0.34 V . Which two electrodes should be combined to get a cell with largest EMF ? . Give net cell
reaction & cell voltage

Answer 1

Explanation:

1/2H2 (g)+AgCl(s) → H+(aq)+Cl–

(aq)+ Ag(s)

occurs in the galvanic cell :

1) Ag AgCl KCl AgNO Ag ( ) ( ) 3( ) s aq aq

2) 2( ) ( ) 3( ) , Pt H HCl AgNO Ag s aq aq

3) 2( ) ( ) ( ) , Pt H HCl AgCl Ag g aq s

4) 2( ) ( ) ( ) , Pt H KCl AgCl Ag