(Answered) When pennies are put in vinegar and salt for 10 minutes is

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When pennies are put in vinegar and salt for 10 minutes. Is the copper metal becoming copper II ion an oxidation or a reduction and why?

When the pennies coated with copper II ion were removed and exposed to the air, the copper II ion combined with oxygen gas to produce a blue product. What is the blue product and write its formula. Also, write the reaction showing copper II (aq) + oxygen gas --> blue product.

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