Copper(II) hydroxide, with the chemical formula Cu(OH)2, is an inorganic compound containing copper in its +2 oxidation state, bonded to two hydroxide ions (OH^-). It is a blue or bluish-green solid.

Preparation of Copper(II) Hydroxide: Copper(II) hydroxide can be prepared by the reaction of copper(II) salts, such as copper(II) sulfate (CuSO4), with a strong base, such as sodium hydroxide (NaOH) or potassium hydroxide (KOH):

CuSO4 + 2 NaOH → Cu(OH)2 + Na2SO4

CuSO4 + 2 KOH → Cu(OH)2 + K2SO4

Properties and Uses of Copper(II) Hydroxide:

• Appearance: Copper(II) hydroxide is a blue or bluish-green solid. Its color may vary depending on the particle size and crystallinity.
• Insolubility: It is insoluble in water, but it can react with acids to form soluble copper(II) salts.
• Applications: Copper(II) hydroxide has limited practical applications. It is sometimes used as a fungicide in agriculture to control certain fungal diseases on crops. It is also used in some organic synthesis reactions and as a laboratory reagent.

Safety Considerations: Copper(II) hydroxide is generally considered to be of low toxicity. However, like other copper compounds, it should be handled with care, and safety precautions should be followed. Avoid inhaling the dust and prevent skin contact by wearing appropriate personal protective equipment (PPE).

As with all chemicals, it is essential to consult the Material Safety Data Sheet (MSDS) and follow strict safety protocols when working with copper(II) hydroxide.