Lesson: Chapter 12 — Electrochemistry

Electrolysing melts and solutions 3 of 5 Reset answers

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Question 3

Why does the blue colour fade when copper sulphate is electrolysed with carbon electrodes?

A Sulphate ions are oxidised B The carbon dissolves C Cu²⁺ ions leave the solution as copper D Oxygen dissolves in it

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Cu²⁺ ions leave the solution as copper. The blue comes from Cu²⁺, which is deposited on the cathode.

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