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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 Anode (+) Water Dissociates 4H2O(l) → 4H+(aq) + 4OH–(aq) Hydroxide Ions are Oxidised 4OH–(aq) → O2(g) + 2H2O(l) + 4e– • As OH–(aq) are oxidised, the concentration of the OH–(aq) at the anode decreases. • The 4H+(aq) that are not reduced will make the solution at the anode acidic (pH < 7). • The indicator bromothymol blue is yellow below pH 6.

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