Essential Chemistry for IGCSE - Making And Identifying Salts (Section 4 - No. 35)
How does a student ensure complete reaction when preparing copper(II) sulfate from copper(II) oxide and sulfuric acid?
Add excess acid, and then filter off the excess acid.
Add excess copper(II) oxide, and then filter off the excess copper(II) oxide.
Use a large beaker to contain the mixture
Stir the mixture with a glass rod
Explanation
To make sure the reaction is complete, they add excess copper(II) oxide so the acid reacts completely and the excess solid is then filtered out.
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