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.
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An effervescent universal indicator rainbow
Experiment | PDF, Size 45.43 kb
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This practical is part of our Chemistry for Non-Specialists collection.
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