Copper(I) chloride, commonly called cuprous chloride, is the lower chloride of copper, with the formula CuCl. The substance is a white solid sparingly soluble in water, but very soluble in concentrated hydrochloric acid.
Molar mass：98.999 g/mol
Appearance：white powder, slightly green from oxidized impurities
Melting point：423 °C (793 °F; 696 K)
Boiling point：1,490 °C (2,710 °F; 1,760 K) (decomposes)
Solubility in water：0.047 g/L (20 °C)
Solubility product (Ksp)：1.72×10−7
Solubility：insoluble in ethanol, acetone; soluble in concentrated HCl, NH4OH
Band gap：3.25 eV (300 K, direct)
Magnetic susceptibility (χ)：-40.0·10−6 cm3/mol
Refractive index (nD)：1.930
Crystal structure：Zincblende, cF20
The main use of copper(I) chloride is as a precursor to the fungicide copper oxychloride.
Cuprous chloride ACTS as a catalyst for many organic reactions.