Indicators and dry ice demonstration

Dry ice in a glass producing a white-grey 'fog' against a black background

Source: © Shutterstock

Create bubbles, ‘fog’ and a colour change adding dry ice to alkaline ammonia or sodium hydroxide solution in this demonstration. Includes kit list and safety instructions.

In this short but spectacular experiment, students observe as dry ice is added to a range of indicator solutions mixed with dilute ammonia or sodium hydroxide solution. The reactions that take place produce bubbles and a ‘fog’, along with a gradual colour change.

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