turning copper into gold

Aim: To turn a copper coin into gold (actually brass but looks gold)

Equipment:

• copper coins
• Sodium Zincate
• Bunsen Burner
• Heat mat

Method-

1. Set up your Bunsen burner
2. Create the Sodium Zincate solution by mixing 1 gram of ZnO and 4 grams of NaOH
3. Boil the solution
3. Dip a copper coin into a solution of sodium Zincate in contact with Zinc to turn it silver.
4. Put the coin over the Bunsen burner flame to turn it gold.