A-LevelChemistryChemical periodicityMay/June 2022Paper 4 Q213 Marks
(e) Aqueous manganese(II) ions show similar chemical properties to aqueous copper(II) ions when reacted separately with NaOH(aq) and with concentrated HCl. (iii) Table 2.1 lists relevant electrode potentials for some electrode reactions. Table 2.1 electrode reaction E/V Mn2+ + 2e- Mn -1.18 Cl2 + 2e¯ 2Cl- +1.36 2HOCl + 2H+ + 2e¯ ⇌ Cl₂ + 2H2O +1.64 MnO2 + 4H+ + 2e¯ = Mn2+ + 2H2O +1.23 MnO4 + 4H+ + 3e¯ MnO2 + 2H2O +1.67
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