State why ...
2 years ago
Experienced GCSE Science and A level Chemistry tutor with Phd
When we want to make sure the other reactant is completely used up. An example is when we are making coppersulphate using copper oxide and sulfuric acid. Copper oxide is added in excess as we want to make sure that all acid is neutralised before we are evaporating all the liquid to obtain the copper sulphate crystals.
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