Standard Electrode Potential of Mercury-Mercurous Electrode at a Number of Temperatures

Department of Chemistry, Patna University, Patna-800 005

From the study of the cell ; Pt Q.H. (sat.) HClO₄(c1)\(|\)HClO₄(c₁)\(|\)HClO₄(c1)\(|\) \(HClO4 (c1)_{}\\ H_{g2}(ClO4)(c2)\)\(|\)Hg, the standard electrode potential of mercury-mercurous electrode has been determined from 5° to 35° at 5° intervals. Over this range of temperatures the results can be expressed by the equation, E_t - 0.80252 - 2.51 x 10^-4t - 1.0668 x 10^-6t². ∆H°, ∆G° and ∆S° of the reaction \(Hg_2^2\)⁺ H₂= 2Hg + 2H+ have also been calculated.