00 V
The reaction with higher value of Eo is preferred and therefore, the
reaction at the cathode during electrolysis is:
H+ (aq) + e– ® ½ H2 (g)
(2 33)
but H+ (aq) is produced by the dissociation of H2O, i e ,
H2O (l ) ® H+ (aq) + OH– (aq)
(2