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Creating an effervescent universal indicator ‘rainbow’
By Grant Birchby and Alan Matear
This quick practical uses existing chemicals in your learning space, for students to observe the effervescent reaction that causes universal indicator to create a ‘rainbow’ of colour. Kit list and safety instructions included.
In this experiment, students will add a sodium carbonate solution 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
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