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The reaction between carbon dioxide and water

Description

When carbon dioxide reacts with water a weak acid is formed. Carbon dioxide is present in exhaled breath. Observing a colour change using an acid-base indicator shows the reaction between carbon dioxide and water.

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 working group will require:

Eye protection

Conical flask (250 cm3), 2

Indicator bottles with dropping pipettes, 3

Ethanol (IDA – Industrial Denatured Alcohol) (HIGHLY FLAMMABLE, HARMFUL)

Thymolphthalein indicator solution (HIGHLY FLAMMABLE), access to small bottle with dropper

Phenol red indicator solution (HIGHLY FLAMMABLE), access to small bottle with dropper

Sodium hydroxide solution, 0.4 M (IRRITANT), small bottle with dropper

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

 



 

 


 


Teaching notes



When carbon dioxide reacts with water a weak acid is formed. Carbon dioxide is present in exhaled breath. Observing a colour change using an acid-base indicator shows the reaction between carbon dioxide and water.

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 .