How do ions decide which electrode to claim in aqueous solutions?

Science · Published 23 October 2026 Swipe more like this →

In short: Electrolysis becomes more complex when water is involved. This video explores the specific rules that govern which ions are selectively discharged at the cathode and anode during the process.

The presentation provides a recap of standard electrolysis before diving into the mechanics of aqueous solutions. It examines the presence of additional ions introduced by water and details the specific rules used to predict which substances will form at each electrode.

Through worked examples, the video demonstrates how to identify the products of electrolysis, making it a vital resource for students preparing for 2027/28 exams across Higher, Foundation, Triple, and Combined science tiers.

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