EduNinja

CAIE IGCSE Chemistry Ionic Half-Equations at Electrodes

CAIE IGCSE Chemistry Ionic Half-Equations at Electrodes
Cambridge IGCSE Chemistry 0620 syllabus for exams in 2026, 2027 and 20282026–2028

Practise constructing electrode half-equations by balancing atoms and charge, placing electrons on the reactant side for reduction and product side for oxidation.

How this is tested

  • write electrons on the left when a cathode species gains them during reduction
  • write electrons on the right when an anode species loses them during oxidation
  • balance atoms and total charge and add state symbols when the question requests them

Question 3(c)(ii)

[Maximum number: 2]

This question is about elements and compounds.

A dilute aqueous solution of potassium chloride undergoes electrolysis.

Oxygen is produced at the anode.

Write an ionic half-equation for the production of oxygen at the anode.