Alternative derivation of the previous equation. a) H2 + 2·H2O → 2·H3O+ (pH=7, -0.42 V) b) 4·OH– → O2 + 2·H2O (pH=7, 0.83V) The answer would be either up or down, left or right. total reaction with the indication that the reaction ·2 It should be done. By the way , why ?2