making soluble salts

Start with fixed volume of dilute sulfuric acid, the limiting reactant (the acid will run out) so …

there is no acid remaining at the end as it would contaminate the salt.

Gently heat acid (to speed up reaction) until almost boiling but do not boil because …

it may bubble over when reactant is added.

Add copper oxide in spatulas and stir so …

the copper oxide can react with the acid.

Continue adding copper oxide until it is in excess so…

all acid has reacted.

Filter copper sulfate so…

you can get rid of unreacted copper oxide.

Heat copper sulfate gently in evaporating basin until half the solution remains so…

crystals start to form.

Leave solution in a cool place for 24 hours…

so crystals can fully form.

Pat crystals with a paper towel so…

they can dry.

reaction equation

CuO + H₂SO₄ → CuSO₄ + H₂O