Doc Brown's Chemistry KS4 science-chemistry GCSE/IGCSE/O level/AS Revision

ELECTROCHEMISTRY revision notes on electrolysis, cells, experimental methods, apparatus, batteries, fuel cells and industrial applications of electrolysis

This section starts with an introduction to electrolysis explaining which liquids conduct and why can some liquids conduct electricity and others cannot? - electrolytes, electrodes, what happens on electrode surfaces, the products of electrolysis. There are tables of electrode reactions, descriptions of experimental methods of electrolysis and a summary table of the electrolysis products from many common melts or aqueous solutions that undergo electrolysis when a d.c. electric current is passed through them. There is also a list of links to revision notes on the application of electrolysis to various industrial processes. Simple cells, batteries and fuel cells are also described. This page should also prove useful for coursework projects in electrolysis e.g. help with ideas, apparatus, experimental methods, products collection, electrode equations and calculations etc. These revision notes on electrolysis should prove useful for the new AQA chemistry, Edexcel chemistry & OCR chemistry GCSE (91, 9-5 & 5-1) science courses.



1. INTRODUCTION to electrolysis - electrolytes, non-electrolytes, electrode equations

2. Electrolysis of acidified water (dilute sulfuric acid) and some sulfate salts and alkalis

3. Electrolysis of sodium chloride solution (brine)

4. Electrolysis of copper(II) sulfate solution and electroplating

5. Electrolysis of molten lead(II) bromide (and other molten compounds)

6. Electrolysis of copper(II) chloride solution

7. Electrolysis of hydrochloric acid

8. Summary of electrode equations and products

9. Summary of electrolysis products from various electrolytes

10. Simple cells (batteries)

11. Fuel Cells e.g. the hydrogen - oxygen fuel cell

LINKS to Industrial Process Pages

12. The electrolysis of molten aluminium oxide - extraction of aluminium from bauxite ore

13. Anodising aluminium to thicken and strengthen the protective oxide layer

14. The extraction of sodium from molten sodium chloride using the 'Down's Cell'

15. The purification of copper by electrolysis

16. The purification of zinc by electrolysis

17. Electroplating coating conducting surfaces with a metal layer

18. Electrolysis of brine (NaCl) for the production of chlorine, hydrogen & sodium hydroxide

AND 19. Electrolysis calculations


(Definitely NOT for GCSE/IGCSE/O level students)

Part 7.1 Redox equilibria, half-cell reactions and electrode potentials

Part 7.2 click me! Simple cells - notation and construction

Part 7.3 click me! The hydrogen electrode and standard conditions

Part 7.4 click me! Half-cell potentials, Electrochemical Series and using Eθcell for reaction feasibility

Part 7.5 click me! Electrochemical cells ('batteries') and fuel cell systems

Part 7.6 click me! Electrolysis and the electrochemical series

Part 7.7 click me! Exemplar Questions, Appendix 1. The Nernst Equation, Appendix 2 Free Energy, Cell Emf and Kc


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