Predicting Binary Product Compounds

Specification Point 3.26:
  • Predict the products of electrolysis of other binary, ionic compounds in the molten state.
  • These products are much easier to predict since there are only one type of anion and cation present, hence there are no H+ or OH ions competing at the electrodes.
  • To predict the products of any binary molten compound first identify the ions present.
  • The positive ion will migrate towards the cathode and the negative ion will migrate towards the anode.
  • Therefore the cathode product will always be the metal and the product formed at the anode will always be the non-metal.

Electrolysis Molten Lead Bromide, Edexcel GCSE Chemistry

Diagram showing the electrolysis of molten PbBr2

Need help?

Edexcel GCSE Chemistry Notes

Want to aim for a Level 9?

See if you’ve got what it takes. Test yourself with our topic questions.

Morgan Curtin Chemistry

Author: Morgan

Morgan’s passion for the Periodic Table begun on his 10th birthday when he received his first Chemistry set. After studying the subject at university he went on to become a fully fledged Chemistry teacher, and now works in an international school in Madrid! In his spare time he helps create our fantastic resources to help you ace your exams.