Description: A silver object that has been previously tarnished (over time or by placing in sodium sulfide) is cleaned by placing it in a pan containing aluminum foil, salt, baking soda and boiling water. An electrochemical cell is produced between the silver sulfide and the aluminum, to form silver and aluminum sulfide.

We can provide a tarnished silver electrode, or you can bring in a silver spoon, candlestick or plate from home to clean for a more realistic demonstration.

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Source: Fun with chemistry - ICE

Year or vol: 2 page: 333

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