Electrolysis of Aqueous Salts

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Electrolysis of Aqueous Salts ( electrolysis-aqueous-salts )

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Electrochemistry Electrolysis of Aqueous Salts – Changes in pH (–) Cathode alkaline (+) Anode acidic Cathode (–) Water Dissociates 2H2O(l) → 2H+(aq) + 2OH–(aq) Hydrogen Ions are Reduced 2H+(aq) + 2e– → H2(g) • As H+(aq) are reduced, the concentration of H+(aq) at the cathode decreases. • The 2OH–(aq) that are not oxidised will make the solution at the cathode alkaline (pH > 7). • The indicator bromothymol blue is yellow below pH 6.

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