RP making salts

Question 1

method

Answer 1

1. measure 20 cm³ sulfuric acid into a measuring cylinder and pour into a beaker
2. heat gently using a bunsen burner
3. add small amounts of copper oxide in excess until no more reacts/no more effervescence
4. filter the solution using filter paper and a funnel
5. pour solution into evaporating basin
6. heat over a bunsen burner until crystals start to form
7. leave basin in a cool place for 24 hours
8. gently pat dry

Question 2

safety

Answer 2

-sulfuric acid is corrosive so wear goggles
-hair tied back (bunsen burner)
-when bunsen burner not in use leave in safety flame or turn off

Question 3

balanced symbol equation for reaction

Answer 3

CuO + H₂SO₄ —-> CuSO₄ + H₂O

Question 4

two methods to separate mixtures used

Answer 4

filtration, crystallisation

Question 5

why is the acid heated?

Answer 5

to ensure all the acid reacts with the copper oxide

Question 6

why is copper oxide added in excess?

Answer 6

to ensure all the acid reacts, so it isn’t the limiting reactant