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The migration of ions: evidence for the ionic model

Description

In an electrolysis experiment, the ions migrate towards electrodes of opposite charge. In this experiment the migration of an intensely coloured purple plume of manganate ions is seen to move towards the positive terminal.

Credits

:
This is an experiment from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry.
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Apparatus Chemicals

Each group of students will need:

Eye protection

Glass microscope slide

Filter or chromatography paper, capable of being cut the same size as the slide

Scissors

Tweezers

DC power supply, capable of delivering up to 40 V (Note 1)

Connecting leads, fitted with a crocodile clip at one end, 2

Potassium manganate(VII) (permanganate) (HARMFUL, OXIDISING, DANGEROUS FOR THE ENVIRONMENT), 1 small crystal

Refer to Health & Safety and Technical notes section below for additional information. 

 







In an electrolysis experiment, the ions migrate towards electrodes of opposite charge. In this experiment the migration of an intensely coloured purple plume of manganate ions is seen to move towards the positive terminal.

ADDITIONAL INFORMATION

This is a resource from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry. This collection of over 200 practical activities demonstrates a wide range of chemical concepts and processes. Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. Practical Chemistry activities accompany Practical Physics and Practical Biology .