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Electrochemistry Electrolysis of Aqueous Salts • Potassium – K+ • Sodium – Na+ • Calcium – Ca2+ • Magnesium – Mg2+ • Aluminium – Al3+ • Zinc – Zn2+ • Iron – Fe2+ / 3+ • Lead – Pb2+ • During electrolysis of the aqueous salt, e.g. CaCl2, hydrogen gas is produced at the cathode, not the metallic element. 2H+(aq) + 2e– → H2(g) • These metals can only be extracted from their compounds by electrolysis of the molten salt, not electrolysis of the aqueous salt. • During electrolysis of the aqueous salt, e.g. CuCl2, the metallic element is produced at the cathode, not hydrogen gas. • • Copper – Cu2+ • Silver – Ag+ Hydrogen – + H Ions Are More Easily ReducedPDF Image | Electrolysis of Aqueous Salts
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