This is the method we used-
- clean coin in salt+vinggar solution
- put 50ml of 2molL+ NaOH into a beaker
- heat bunsen burner until nearly boiling - stair as heating then take off heat
- add a spatula of zinc powder
- heat lightly for 3 min, with a coin in - stir as heating
- take the coin out with tongs
- rinse coin under water to remove chunks of zinc.
- wave coin in the blue flame using tongs.
Observation-
Because of the zinc hydroxide solution, the coin turned to a silver colour and when we waved the silver coin turned to gold colured.
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