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galina1969 [7]
4 years ago
6

What causes clean change ?​

Geography
1 answer:
Viefleur [7K]4 years ago
5 0

Here's what's happening: The oxygen in the air and the copper in the pennies form an oxide that coats the pennies and makes them look dirty. The acids (usually vinegar - acetic acid) break the copper oxide free from the penny. As we have seen experimentally, acid alone does not clean as well as acid and salt.

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