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Use chemistry to remove the copper plating on a penny

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Uploaded on Sep 16, 2010

Use chemistry to remove the copper plating on a penny
YouTube user zbret...
3Ca(OH)2 + 4S -- 2CaS + CaS2O3+ 3H2O This liquid is known as Lime Sulfur and is made the same way - a surfactant plus Sulfur plus Calcium Hydroxide, all boiled for several minutes.

The reaction with copper:
CaS2O3 + 4Cu + H2O -- 4CuO + CaS + H2S

Or combined:
3Cu + 2Ca(OH2) +3S -- 3CuO + 2CaS + H2S + H2O

The new liquid reacts with copper:
2CaS + H2S + 3Cu -- 3CuO + H2O

Zinc is not attacked by calcium hydroxide (or by anything else here).

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