If you have ever seen a bluish color on a penny, it is likely Copper Acetate(WSDTY). These fine blue copper acetate crystals form when copper reacts with acetic acid.

1:Make calcium acetate. Add calcium carbonate to vinegar. Mix until the calcium carbonate is completely dissolved. You can order calcium carbonate from a chemical supplier, but this is not necessary as it is the main ingredient in chalk.

Use plain white vinegar.You can simply grind up chalk to make calcium carbonate powder.Goggles and gloves should be worn while working with acids.Use half as much calcium carbonate by volume as vinegar. For example, if you use 2 cups (473 ml) of vinegar, use 1 cup (237 ml) of calcium carbonate.

2:Add the calcium acetate to a copper sulfate solution. Copper sulfate is another easy chemical to find at a home and garden store. It is often branded as a fungicide. It may also be labeled as a stump killer. It is found dissolved in water

Pour the calcium acetate solution in slowly until the color turns blue. The blue color indicates that you have made copper acetate.The resulting solution should be blue in color.Avoid getting the solution on your skin or in your eyes by wearing gloves and goggles.

3:Filter the solution. The blue solution contains dissolved copper acetate. There will also be a solid that precipitates out of the solution (calcium sulfate). Pour the solution through a strainer to remove the calcium sulfate. You will be left with a blue copper acetate solution.

Calcium sulfate is irritating to the skin and eyes, so wear goggles and gloves while handling it. If you get any on your skin, wash immediately with soap and water. If you get it in your eyes, flush them with warm water for at least 15 minutes.You can safely dispose of small amounts of calcium sulfate (under 5 lbs or 2.3 kg) in a regular trash container, as long as the container is in good shape and has a tightly sealed lid.Consider saving your calcium sulfate to use in other experiments, such as heating with charcoal to produce calcium sulfide.

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