Copper(II) acetate, with the chemical formula Cu(CH3COO)2, is an insoluble salt of acetate. It is a light blue or greenish-blue crystalline compound that is commonly used as a fungicide, wood preservative, and mordant in dyeing.
Preparation of Copper(II) Acetate:
Copper(II) acetate can be prepared by reacting copper(II) oxide or copper(II) hydroxide with acetic acid. Here's a step-by-step procedure for its preparation:
Materials and Equipment:
- Copper(II) oxide or copper(II) hydroxide
- Acetic acid (glacial acetic acid, CH3COOH)
- Distilled water
- Glassware (beakers, stirring rod, filter paper, funnel)
- Hot plate or heating mantle
Procedure:
1. Dissolve Copper Compound in Acetic Acid:
- Add approximately 10 grams of copper(II) oxide or copper(II) hydroxide to a beaker.
- Pour 50 mL of glacial acetic acid into the beaker and stir the mixture until the solid is completely dissolved.
2. Heat the Solution:
- Place the beaker on a hot plate or heating mantle and heat the solution gently until it starts boiling.
3. Filter the Hot Solution:
- Remove the beaker from the heat and allow the solution to cool slightly.
- Filter the hot solution through a filter paper into a clean beaker.
4. Crystallization:
- Allow the filtrate to cool undisturbed at room temperature. As the solution cools, copper(II) acetate will begin to crystallize.
5. Collect the Crystals:
- After the solution has completely cooled, you will observe blue or greenish-blue crystals of copper(II) acetate formed at the bottom of the beaker.
6. Wash and Dry the Crystals:
- Carefully decant the remaining liquid from the beaker without disturbing the crystals.
- Wash the crystals with a small amount of cold distilled water to remove any impurities.
- Allow the crystals to dry on filter paper or a watch glass.
Your copper(II) acetate crystals are now ready for use or further purification if necessary.
Note: Copper(II) acetate is slightly soluble in water, so it can be dissolved in a small amount of hot water if desired. However, it is important to note that the solubility of copper(II) acetate decreases as the temperature decreases, so the solution may become cloudy or precipitate crystals as it cools.
