English National Curriculum - Science

Electrolysis of aqueous solutions - Required practical

Mission Objectives

Carry out the required practical for electrolysis of aqueous ionic compounds safely and accurately

Record and analyse observations to identify the products formed at each electrode

Compare practical results with predictions to explain the effect of water on the products of electrolysis

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Keywords

Words and meanings to learn

hypothesis

a prediction or proposed explanation made at the start of an investigation, based on prior knowledge or scientific understanding, that can be tested by conducting an experiment

electrodes

conductors, usually made of a metal or carbon, that allow current to pass into and out of an electrolyte during electrolysis

aqueous solution

a solution in which water is the solvent; substances dissolved in water are shown with the state symbol (aq)

electrolysis

the process of using electricity to break down an ionic compound (when molten or in aqueous solution) into its elements

discharge

refers to the process by which ions gain or lose electrons at an electrode, forming neutral atoms or molecules (e.g., metals, hydrogen, halogens)

This lesson has been written by

Samantha Batch

Samantha is an accomplished science educator with over 15 years of leadership experience and a strong background in scientific analysis. She has a proven record of leading departments effectively, improving practice, and working collaboratively with stakeholders.

In her current work, Samantha embeds evidence-informed pedagogical principles such as retrieval practice, clear modelling, and effective sequencing to support high-quality curriculum design and professional development. She draws on assessment insight and common misconceptions to help teachers secure strong student understanding.

She is a former Head of Chemistry and Sixth Form Tutor at Ilkley Grammar School, with extensive Key Stage 4 and 5 experience, and an AQA examiner, giving her valuable insight into assessment standards and exam requirements.

In her spare time, Samantha enjoys playing the accordion with her local orchestra and has recently taken up cricket. 

Required Resources

Handouts

  • copper(II) chloride solution
  • copper(II) sulfate solution
  • sodium chloride solution
  • sodium sulfate solution
  • 100 cm3 beaker 
  • petri dish lid
  • two carbon rod electrodes
  • two crocodile/4 mm plug leads
  • low voltage power supply
  • blue litmus paper
  • tweezers.

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