Iv) find the ph of a solution placed in a hydroquinone half-oell which are coupled with saturated calomel electrode (sce). the e.m.f. of a combined cell was fou

iv) Find the pH of a solution placed in a hydroquinone half-oell which are coupled with saturated calomel electrode (SCE). The e.m.f. of a combined cell was found to be 0.123V at 25°C. (Given Standard Oxidation potential of SCE is -0.242 V and that of quinhydrone electrode is -0.699 V) (3)