Make your money GROW
This should only be performed as a demonstration. Gloves and goggles should be worn at all times by students and teacher.
Step 1) Place zinc powder (10g) in approximately 30cm3 of a 2.0 M NaOH solution and heat over a Bunsen burner.
Step 2) Clean a copper coin with methylated spirits and place in the boiling mixture for one minute.
|Step 3) Remove the copper coin which now has a silver appearance. This coin is covered with zinc metal. Wash the shiny coin under a tap and dry with a paper towel.
Step 4) Heat the coin over the blue flame of a Bunsen burner. Watch as the coin changes from a silver to gold appearance.
equipment. Goggles and lab coates must be worn by all observers and