A. So it will react faster with the copper (III) sulfate crystals.
B. Because copper (III) sulfate crystals will not react with cold dilute sulfuric acid.
C. To make the copper (III) sulfate crystals dissolve faster.
D. So that more copper (III) sulfate can dissolve.
The diagram shows how hydrated copper(II) sulfate crystals can be made by reacting copper(II) oxide with dilute sulfuric acid.
Why do crystals form when the hot saturated solution is cooled in stage 5?