-clean coin in salt+vinegar solution.
-put 50ml of 2molL NaOH into beaker.
-Heat on Bunsen burner until NEARLY boiling - stir as heating.
Add a spatula of zinc powder.
-Heat lightly for 3min,with coin in-stir as heating.
-Take coin out with tongs
-Rinse coin under water to remove chunks of zinc.
-wave coin in blue flame using tongs
The colour of the coin changed from bronze to a silver colour and when it was under the blue flame it went to a gold colour.
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