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copper chloride dihydrate formula is the dihydrate form of copper(II) chloride. It is an important copper(II) salt with many specialized applications in organic and inorganic reactions, including the chlorination of hydrocarbons and the preparation of copper(II) oxychloride. It is also used as a catalyst to cleave tetrahydropyranyl (THP) ethers and t-butyldimethylsilyl (TBDMS) ethers and to chemoselectively hydrolyze semicarbazones to carbonyl compounds. Other industrial applications include copper plating on aluminum and tinting baths for iron and tin, as a mordant in dyeing and printing of textiles, a reagent in the manufacture of invisible and laundrymarking inks, and in the extraction of mercury from ores. In photography it is used as a fixer and desensitizer. It is also a component of glass and ceramic pigments, and it is used as a wood preservative and disinfectant. Copper(II) chloride dihydrate is a brownish-yellow, hygroscopic powder or it can be formed as green deliquescent crystals. It reacts violently with potassium and sodium and can form shock-sensitive acetylides in contact with them. It is highly soluble in water, ethanol and methanol; it is slightly soluble in acetone and pyridine; it is very soluble in ether.

Copper(II) chloride dihydrate irritates the skin and eyes, and it is toxic if inhaled. Production personnel should wear protective clothing, gloves and eye protection, and work in a well-ventilated area. It may be converted to cuprous chloride in alkaline solution, and can be reduced to red copper(II) chloride by glucose and other reducing agents.