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IGCSE Chemistry
Making crystals
Three samples of crystals made by IGCSE Chemistry students in lessons
Questions - What reactants could you use to make these compounds in an IGCSE Chemistry practical class?
1 sodium ethanoate
2 sodium chloride
3 ammonium sulfate
In each case the salts were made in an acid + alkali reaction carried out in a 100ml beaker.
Small volumes of the alkali were added to a approximately 20ml of dilute acid using a plastic dropping pipette. The pH change was monitored after each addition of alkali by sampling with a glass stirring rod and spotting onto Universal Indicator paper.
Answers
1 sodium hydroxide and ethanoic acid
2 sodium hydroxide and hydrochloric acid
3 dilute aqueous ammonia and sulphuric acid
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RYD date created : 2025-02-05T22:40:08.9322802Z
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