CAIE IGCSE Chemistry Products of Aqueous Halide Electrolysis

Practise predicting products from dilute or concentrated aqueous halides by considering water-derived ions alongside the dissolved cations and halides.

Exam points

predict hydrogen or a deposited metal at the cathode by considering the aqueous cation
predict oxygen from dilute halide solution but the halogen from a concentrated chloride or bromide
use observations such as bubbles, colour or electrode mass change to identify the product

[Maximum number: 1]

A student electrolyses aqueous copper(II) sulfate using the apparatus shown.

Figure for Question 4.1.10—Predict the identity of the products question 1 — CAIE IGCSE Chemistry

Oxygen gas forms at the positive electrode (anode).

What difference would the student observe at the positive electrode if the aqueous copper(II) sulfate were replaced by concentrated aqueous copper(II) chloride?

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4.1.10—Predict the identity of the products question 1