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Making a pH indicator

Description

A pH indicator is a substance that has a different colour when added to acid or alkali. In this experiment a pH indicator is made from red cabbage.

Credits

:
This is an experiment from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry.
making-a-ph-indicator



Apparatus Chemicals

Eye protection for all

Each working group will require

Beaker (250 cm3)

Bunsen burner

Tripod

Gauze

Heat resistant mat

Test-tubes, 3 (Note 1)

Test-tube rack

Dropper pipette

Several pieces of red cabbage

Access to:

Dilute hydrochloric acid, 0.01 M

Sodium hydroxide solution, 0.01 M

De-ionised or distilled water

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

 






A pH indicator is a substance that has a different colour when added to acid or alkali. In this experiment a pH indicator is made from red cabbage.

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 .