What will happen if you soak the penny to vinegar overnight?

If you soak a penny in vinegar overnight, a chemical reaction will occur between the vinegar (acetic acid) and the copper in the penny. This reaction will produce copper acetate, which is a blue-green compound. The penny will therefore change color from its original copper color to a blue-green color.

The chemical reaction that takes place can be represented by the following equation:

Cu(s) + 2CH3COOH(aq) → Cu(CH3COO)2(aq) + H2(g)

In this equation, Cu(s) represents the solid copper penny, CH3COOH(aq) represents the acetic acid in the vinegar, Cu(CH3COO)2(aq) represents the copper acetate that is produced, and H2(g) represents the hydrogen gas that is released as a byproduct of the reaction.

The copper acetate that is produced is soluble in water, so it will dissolve into the vinegar. This will cause the vinegar to turn a blue-green color. The penny will also be coated in a layer of copper acetate, which will give it a blue-green color.

The rate at which the penny changes color will depend on a number of factors, including the concentration of the vinegar, the temperature of the vinegar, and the surface area of the penny. The higher the concentration of the vinegar, the higher the temperature of the vinegar, and the larger the surface area of the penny, the faster the penny will change color.

If you leave the penny in the vinegar for a long period of time, it will eventually dissolve completely. The time it takes for the penny to dissolve will depend on the same factors that affect the rate at which the penny changes color.