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 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 flash point Non-flammable related Compounds other anions CuSO4, CuCl2, CuO, Cu(NO3)2, CuCO3 various other cations NaOH, KOH, Mg(OH)2, Ca(OH)2, Ni(OH)2, Al(OH)3 other than where detailed otherwise, data are provided for materials in their conventional state(at 25°C, 100kPa)Infobox disclaimer and also references

Copper(II) hydroxide (chemical formula Cu(OH)2) is the hydroxide of the metal copper. The typical color of copper hydroxide is blue. Some develops of copper(II) hydroxide are offered as "stabilized" copper hydroxide, quite likely a mixture the copper(II) carbonate and also hydroxide. This are regularly greener in color.

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2 chemical Properties



Copper(II) hydroxide has actually been recognized to man due to the fact that copper smelting began around 5000 BCE although the alchemists were probably the an initial to produce it.<1> This was quickly done by mixing solutions of lye and blue vitriol, both chemicals which were well-known in antiquity.

It was developed on an commercial scale throughout the 17th and 18th centuries for use in pigments such as blue verditer and also Bremen green.<2> this pigments were used in ceramics and painting.<3>

chemistry Properties


Copper(II) hydroxide have the right to be produced by adding a little amount of sodium hydroxide to a dilute equipment of copper(II) sulfate (CuSO4 · 5H2O). The precipitate developed in this manner, however, often includes an appreciable amount of salt hydroxide impurity and also a purer product have the right to be attained if ammonium chloride is added to the equipment beforehand. Alternatively, copper hydroxide is easily made by electrolysis that water (containing a small electrolyte such as sodium bicarbonate). A copper anode is used, regularly made from scrap copper.

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

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

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


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

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

Since copper(II) hydroxide is mildly amphoteric, the dissolves contempt in concentrated alkali, developing 2-.<7>

usage as an organic reagent

Copper(II) hydroxide has a rather devoted role in essential synthesis. Often, once it is utilized for this purpose, that is all set in situ by mixing a soluble copper(II) salt and also potassium hydroxide.

It is sometimes used in the synthetic of aryl amines. Because that example, copper(II) hydroxide catalyzes the reaction the 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 additionally converts mountain hydrazides to carboxylic mountain at room temperature. This is especially useful in synthesizing carboxylic acids through other fragile functional groups. The released yields are generally excellent as is the instance with the manufacturing of benzoic acid and also octanoic acid.

organic occurrence

Copper(II) hydroxide is discovered in several various copper minerals, most notably azurite, malachite, antlerite, and also brochantite. Azurite (2CuCO3 • Cu(OH)2) and also malachite (CuCO3 • Cu(OH)2) are carbonates if antlerite (CuSO4 • 2Cu(OH)2) and also brochantite (CuSO4 • 3Cu(OH)2) are sulfates. Copper(II) hydroxide is rarely discovered as an uncombined mineral due to the fact that it progressively reacts with carbon dioxide indigenous the environment to type a simple copper(II) carbonate.


Copper(II) hydroxide has actually been supplied as an alternative to the Bordeaux mixture, a fungicide and also nematacide.<8> Nowadays, that is disfavored because of eco-friendly contamination problems. Copper(II) hydroxide is also occasionally supplied as ceramic colorant.


Copper(II) hydroxide is a skin, eye and also respiratory irritant. Constantly wear safety and security glasses when managing copper hydroxide. In case of contact with eyes, rinse immediately with lot of of water and seek clinical advice.


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

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This short article is licensed under the GNU free Documentation License. The uses material from the Wikipedia short article "Copper(II)_hydroxide". A list of authors is obtainable in Wikipedia.