Copper(I) hydroxide

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Copper(I) hydroxide
Other names
Cuprous hydroxide; Copper monohydroxide
3D model (JSmol)
Molar mass 80.55 g/mol
US health exposure limits (NIOSH):
PEL (Permissible)
TWA 1 mg/m3 (as Cu)[1]
REL (Recommended)
TWA 1 mg/m3 (as Cu)[1]
IDLH (Immediate danger)
TWA 100 mg/m3 (as Cu)[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Copper(I) hydroxide is the hydroxide of the metal copper with the chemical formula of CuOH. It is a mild, highly unstable alkali. The color of pure CuOH is yellow or orange-yellow, but it usually appears rather dark red because of the impurity substances. It is extremely easy to be oxidated even at room temperature.


Copper(I) hydroxide can be prepared according to the following reaction:

In this reaction, ethanol serves as a catalyst. It can also be a solvent for the byproduct sulfur and thus get rid of it.

Another method is by the double decomposition of CuCl and NaOH

Notably, this method is rarely used because the CuOH produced will gradually dehydrate and eventually turn into Cu2O.


Similar to iron(II) hydroxide , copper(I) hydroxide can be easily oxidated into copper(II) hydroxide: