A-LevelChemistryElectrochemistryOct/Nov 2021Paper 4 Q39 Marks
Pure water is a very poor conductor of electricity. However, when hydrogen chloride gas is dissolved in water, ions are formed and a current flows during electrolysis. HCl(g) + aq → H⁺(aq) + Cl⁻(aq) The overall change after electrolysis is that hydrogen chloride gas is converted into hydrogen and chlorine. 2HCl(g) → H₂(g) + Cl₂(g) When a current of 3.10A is passed through the solution for Y minutes, 351 cm³ of chlorine are produced at the anode, measured under room conditions.
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