Copper(I) chloride

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Copper(I) chloride
Copper I chloride exf community.jpg
CuCl prepared by a member of the Ex&F community.
IUPAC name
Copper(I) chloride
Other names
Copper monochloride
Cuprous chloride
Molar mass 98.999 g/mol
Appearance White solid
Density 4.14 g/cm3
Melting point 423 °C (793 °F; 696 K)
Boiling point 1,490 °C (2,710 °F; 1,760 K) (decomposes)
0.47 g/100 ml (20 °C)
Solubility Soluble in aq. ammonia, conc. HCl
Insoluble in acetone, ethanol
Vapor pressure ~0 mmHg
Safety data sheet Sigma-Aldrich
Flash point Non-flammable
Lethal dose or concentration (LD, LC):
140 mg/kg
Related compounds
Related compounds
Copper(II) chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Copper(I) chloride, also called cuprous chloride, has the chemical formula CuCl. It is a white, almost insoluble salt which is slowly oxidized by air to Cu(II).



CuCl is almost completely insoluble in water. It does however form complexes and dissolve in concentrated hydrochloric acid and ammonium hydroxide (aq. ammonia), as well as in cyanide and thiosulfate solutions.


Pure samples of copper(I) chloride appear as white, dense, cubical crystals. As it is slowly oxidized in air, older samples may appear dirty green or brown.


Copper(I) chloride can be prepared by reduction of copper(II) ions in presence of chloride ions. Possible methods include bubbling sulfur dioxide through an aqueous solution of copper(II) chloride, or heating a solution of copper sulfate, sodium chloride and ascorbic acid. It can also be produced by boiling copper(II) chloride and copper metal in hydrochloric acid.




Cuprous chloride is irritant and corrosive to eyes and skin. Protection clothing should be worn when handling it.[1]


CuCl should be kept in sealed containers, away from oxygen. Schlenk flasks are a good storage container.


CuCl can be oxidized with oxygen or hydrogen peroxide to the more soluble CuCl2, which can be reduced to metallic copper with a more reactive metal, such as iron or zinc.



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