Copper(II) hydroxide Identifiers Properties Hazards
IUPAC name Copper(II) hydroxide
other names Cupric hydroxide
CAS number 20427-59-2
molecule formula Cu(OH)2
Molar mass 97.561 g/mol
Appearance Blue or blue-green solid
Density 3.37 g/cm3, solid
melt point

n/a, decomposes right into CuO

Solubility in water insoluble
Solubility in ethanol insoluble
main hazards Skin, Eye, & respiratory tract Irritant
NFPA 704
R-phrases R36 R37 R38 S-phrases S26 speed point Non-flammable related Compounds other anions CuSO4, CuCl2, CuO, Cu(NO3)2, CuCO3 other cations NaOH, KOH, Mg(OH)2, Ca(OH)2, Ni(OH)2, Al(OH)3 except where provided otherwise, data are given for products in their conventional state(at 25°C, 100kPa)Infobox disclaimer and references

Copper(II) hydroxide (chemical formula Cu(OH)2) is the hydroxide of the metal copper. The typical shade of copper hydroxide is blue. Some creates of copper(II) hydroxide are sold as "stabilized" copper hydroxide, quite most likely a mixture of copper(II) carbonate and hydroxide. These are frequently greener in color.

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2 chemical Properties



Copper(II) hydroxide has actually been recognized to man since copper smelting began around 5000 BCE return the alchemists were most likely the first to to produce it.<1> This was quickly done through mixing services of lye and blue vitriol, both chemistry which were well-known in antiquity.

It was created on an industrial scale throughout the 17th and also 18th century for usage in colors such together blue verditer and also Bremen green.<2> these pigments were offered in ceramics and also painting.<3>

chemical Properties


Copper(II) hydroxide deserve to be produced by including a little amount of sodium hydroxide come a dilute equipment of copper(II) sulfate (CuSO4 · 5H2O). The precipitate developed in this manner, however, often has an appreciable amount of sodium hydroxide impurity and a purer product deserve to be attained if ammonium chloride is added to the solution beforehand. Alternatively, copper hydroxide is easily made by electrolysis the water (containing a little electrolyte such as sodium bicarbonate). A copper anode is used, frequently made indigenous scrap copper.

"Copper in moist air slowly acquires a dull environment-friendly coating. The eco-friendly material is a 1:1 mole mixture of Cu(OH)2 and CuCO3."<4>

2Cu(s) + H2O(g) + CO2(g) + O2(g) ---> Cu(OH)2(s) + CuCO3(s)

This is the patina that develops on bronze and also other copper alloy statues such together the Statue the Liberty.


Moist samples the copper(II) hydroxide slowly turn black due to the development of copper(II) oxide.<5> as soon as it is dry, however, copper(II) hydroxide does not decompose uneven it is heated come 185°C.<6>

Copper(II) hydroxide reacts through a equipment of ammonia to type a deep blue equipment consisting the the 2+ facility ion, however the hydroxide is reformed when the systems is diluted through water. Copper(II) hydroxide in ammonia solution, well-known as Schweizer"s reagent, possesses the interesting capacity to dissolve cellulose. This property brought about it being offered in the manufacturing of rayon, a cellulosic fiber.

Since copper(II) hydroxide is mildly amphoteric, the dissolves slightly in focused alkali, forming 2-.<7>

use as an essential reagent

Copper(II) hydroxide has actually a rather specialized role in necessary synthesis. Often, when it is utilized for this purpose, the is ready in situ by mixing a soluble copper(II) salt and potassium hydroxide.

It is occasionally used in the synthetic of aryl amines. For example, copper(II) hydroxide catalyzes the reaction that ethylenediamine through 1-bromoanthraquinone or 1-amino-4-bromoanthraquinone to form 1-((2-aminoethyl)amino)anthraquinone or 1-amino-4-((2-aminoethyl)amino)anthraquinone, respectively.

Copper(II) hydroxide likewise converts acid hydrazides come carboxylic acids at room temperature. This is especially useful in synthesizing carboxylic acids with other breakable functional groups. The published yields are generally excellent together is the instance with the production of benzoic acid and also octanoic acid.

organic occurrence

Copper(II) hydroxide is found in several different copper minerals, most notably azurite, malachite, antlerite, and also brochantite. Azurite (2CuCO3 • Cu(OH)2) and also malachite (CuCO3 • Cu(OH)2) are carbonates when antlerite (CuSO4 • 2Cu(OH)2) and also brochantite (CuSO4 • 3Cu(OH)2) room sulfates. Copper(II) hydroxide is rarely discovered as one uncombined mineral because it slowly reacts v carbon dioxide from the setting to kind a an easy copper(II) carbonate.


Copper(II) hydroxide has actually been supplied as an different to the Bordeaux mixture, a fungicide and nematacide.<8> Nowadays, that is disfavored because of environmental contamination problems. Copper(II) hydroxide is likewise occasionally provided as ceramic colorant.


Copper(II) hydroxide is a skin, eye and respiratory irritant. Always wear safety and security glasses when handling copper hydroxide. In case of call with eyes, rinse automatically with lot of of water and also seek medical advice.


Roscoe, H. E., & Schorlemmer, C. (1879). A treatise on Chemistry second Ed, Vol 2, component 2. MacMillan & Co. (p 498). Paquette, Leo A. (1995). Encyclopedia the Reagents for Organic Synthesis, 8 Volume Set. Wiley. ISBN 0-4719-3623-5.

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This post is licensed under the GNU free Documentation License. That uses material from the Wikipedia write-up "Copper(II)_hydroxide". A perform of authors is accessible in Wikipedia.