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An equilibrium involving chromate(VI) and dichromate(VI) ions

Description

Dilute sulphuric acid is added to an aqueous solution of potassium chromate(VI). The reaction is reversed using aqueous sodium hydroxide.

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

For one demonstration:

Eye protection: goggles

Test-tube

Test-tube holder

Dropping pipette

Potassium chromate(VI) solution, 0.2 M (TOXIC, OXIDISING, DANGEROUS FOR THE ENVIRONMENT), about 1 cm3

Sodium hydroxide solution, 1.0 M (CORROSIVE), about 10 cm3

Dilute sulfuric acid, 1.0 M (IRRITANT), about 5 cm3

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

 






Dilute sulphuric acid is added to an aqueous solution of potassium chromate(VI). The reaction is reversed using aqueous sodium hydroxide.

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.