Make your money GROW Demonstration |
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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. |
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Step 2) Clean a copper coin with methylated
spirits and place in the boiling mixture for one minute.
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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. ** Safety
equipment. Goggles and lab coates must be worn by all observers and
demonstrators. |