An effervescent Universal indicator ‘rainbow’

Description

Sodium carbonate solution is added to a burette containing a little hydrochloric acid and Universal Indicator. The two solutions react, with effervescence, and the liquid in the burette shows a ‘rainbow’ of all the colours of Universal Indicator from red through orange, yellow, green and blue to purple.

Type of Activity

:
demonstration

Audience

:
Teacher

Age Group

:
11 to 18 years
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Hands-on practical activities or ideas for front of class demonstrations

ADDITIONAL INFORMATION

This practical is part of our Chemistry for non-specialists collection.