Copper(II) borate, with the chemical formula CuB4O7 or Cu(BO2)2, is an inorganic compound containing copper in its +2 oxidation state, bonded to boron and oxygen ions. It is also known as cupric borate or copper metaborate.

Preparation of Copper(II) Borate: Copper(II) borate can be prepared by the reaction of copper(II) oxide (CuO) or copper(II) hydroxide (Cu(OH)2) with boric acid (H3BO3):

CuO + B2O3 → CuB4O7

Cu(OH)2 + 2 H3BO3 → CuB4O7 + 4 H2O

Properties and Uses of Copper(II) Borate:

• Appearance: Copper(II) borate is typically a green or blue-green crystalline solid, depending on its exact composition and hydration state.
• Solubility: It is sparingly soluble in water and is more soluble in acidic solutions.
• Applications: Copper(II) borate has limited practical applications. It is sometimes used as a flame retardant and wood preservative. It is also used as a pigment in certain glass and ceramics.

Safety Considerations: Copper(II) borate 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) borate.