Question

What characteristic of acid can make tarnished and dark copper coins into shiny and clean coins.

Answer 1

Answer:

Over time, they become dull as the copper reacts with oxygen in the air to form copper oxides. Copper oxides are really dark, and so they make the penny less shiny! The acetic acid in vinegar breaks down these copper oxides! This effectively removes the dark molecules leaving a shiny penny behind.

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Answer 2

• As we know that when the copper reacts with oxygen in the air, it will oxidize and form copper oxide.
• Due to copper oxide, copper coins look dark, dull, and tarnished.
• To make copper coins clean and shiny it put them in vinegar and salt solution.
• Table salt and vinegar solution dissolve copper oxide. it dissolves in acid as we know vinegar is acetic acid. coins become clean and shiny.
• Vinegar is a solution of water and acetic acid and salt is sodium chloride.