Basic information Description Chemical Properties Uses Preparation References Safety Related Supplier
Cupric hydroxide Chemical Properties
- Density 3.4
- storage temp. Inert atmosphere,2-8°C
- solubility H2O: insoluble(lit.)
- form Powder
- color Blue
- Water Solubility Slightly soluble in waterSoluble in acids, ammonium hydroxide, dilute hydrochloric acid, concentrated alkali and potassium cyanide. Insoluble in water, ethanol, and acetone.
- Sensitive Hygroscopic
- Merck 14,2642
- Solubility Product Constant (Ksp)pKsp: 19.66
- Stability:Stable, but hygroscopic. Store in dry conditions.
- CAS DataBase Reference20427-59-2(CAS DataBase Reference)
- NIST Chemistry ReferenceCopper hydroxide(20427-59-2)
- EPA Substance Registry SystemCupric hydroxide (20427-59-2)
Cupric hydroxide Usage And Synthesis
- DescriptionCupric hydroxide appears as a blue powder and it is not stable. Cupric hydroxide is used as a mordant and pigment, in the manufacture of many copper salts, and for staining paper. It is used as a fungicide/bactericide on fruits, vegetables, and ornamentals. It can be used as catalyst, feed additive, and a cuprammonium rayon process reagent to make the first semi-synthetic fiber product, Rayon.
Furthermore, cupric hydroxide is used in the wood preservative products in aqueous systems.
- Chemical PropertiesCopper(II) hydroxide, Cu(OH)2, is thermodynamically unstable with respect to decomposition to the oxide. Copper(II) hydroxide prepared by the addition of sodium hydroxide to a salt of copper decomposes at temperatures above 100°C, and in the presence of excess alkali, it decomposes at temperatures above 50°C. It is virtually insoluble in water and decomposes in hot water to the more stable copper(II) oxide and water. Copper(II) hydroxide dissolves quickly in mineral acids and ammonia solution. It is mildly amphoteric, and in concentrated alkali, it forms [Cu(OH)3]- or [Cu(OH)4]2- ions. Copper(II) hydroxides can be produced in a kinetically stabilized form depending on the method of precipitation and choice of additives.
- UsesCopper(II) hydroxide has been used as an alternative to the Bordeaux mixture, a fungicide and nematicide.
The orthorhombic nature of copper hydroxide crystals was determined by X ray diffraction. Copper hydroxide can act as a heterogeneous catalyst in the selective oxidative cross coupling of terminal alkynes to yield their corresponding ynamides.
Copper(II) hydroxide is also occasionally used as ceramic colorant. Used as an active precursor in the production of copper(II) compounds. Ammonia-processed copper(II) hydroxide is used in the production of copper(II) naphthenate, copper(II) 2-ethylhexanoate, and copper soaps. Ammonia-processed copper(II) hydroxide is also used in the production of rayon (Schweiter's reagent) and in the stabilization of nylon; as a feed additive, a catalyst in the vulcanization of polysulfide rubber, and an antifouling pigment.
Copper hydroxide based monoliths can be used in the synthesis of copper hydroxide-based monolithic xerogels. Potential applications of this metal organic frameworks (MOFs) include gas storage, separation, drug delivery, and biomedicine. Supported Cu(OH)x can be used as a catalyst for the aerobic cross dehydrogenative coupling of benzenethiols and cyclic amides to yield N-acylsulfenamides.
- PreparationCopper(II) hydroxide is produced by a reaction of copper oxychloride in an aqueous suspension with alkali hydroxide or alkaline earth metal hydroxide in the presence of a stabilizing agent and the product is separated and washed.
Cu(NO3)2 + NaOH --->Cu(OH)2 + NaNO3
Add a magnetic stirring bar to the beaker and place the flask on a microscale magnetic stirrer. At room temperature, with stirring, carefully add 6M NaOH solution dropwise until the solution is basic to red litmus paper. Use a capillary tube to remove sample for pH testing. A light blue precipitate of copper(II) hydroxide is formed as this reaction is carried out. Make sure the litmus paper has actually changed from red to blue, rather than simply being colored blue by the blue precipitate.
- References Michael Ash, Handbook of Preservatives, 2004
 Günter Joseph and Konrad J. A. Kundig, Copper: Its Trade, Manufacture, Use, and Environmental Status, 1999
 Bo Liu, Bin Liu, Yongbo Zhou and Wanzhi Chen, Copper(II) Hydroxide Complexes of N-Heterocyclic Carbenes and Catalytic Oxidative Amination of Arylboronic Acids, Organnometallics, 2010, vol. 29, 1457-1464
 George B. Kauffman, Rayon: The first semi-synthetic fiber product, Journal of Chemical Education, 1993, vol. 70, 887
- Chemical PropertiesBlue powder.Soluble in acids and ammonium hydroxide; insoluble in water.
- Chemical PropertiesBlue, gelatinous or amorphous powder. Insoluble in water.
- UsesIn manufacture of rayon, battery electrodes, other Cu salts; as mordant in dyeing; as pigment; in fungicides, insecticides; as feed additive; in treating and staining paper; in preparation of Schweitzer's reagent; in catalysts.
- HazardToxic by ingestion and inhalation.
- Potential ExposureInorganic copper fungicide, nematicide, and microbiocide
- ShippingUN3077 Environmentally hazardous substances, solid, n.o.s., Hazard class: 9; Labels: 9-Miscellaneous hazardous material, Technical Name Required.
- IncompatibilitiesReacts with calcium (metal hydroxides), nitroethane, nitromethane, 1-nitropropane, zirconium
- Waste DisposalCopper-containing soluble wastes can be concentrated through the use of ion exchange, reverse osmosis, or evaporators to the point where copper can be electrolytically removed and sent to a reclaiming firm. If recovery is not feasible, the copper can be precipitated through the use of caustics and the sludge deposited in a chemical waste landfill Copper-containing wastes can be concentrated through the use of ion exchange, reverse osmosis, or evaporators to the point where copper can be electrolytically removed and sent to a reclaiming firm. Details of copper recovery from a variety of industrial wastes have been published. If recovery is not feasible, the copper can be precipitated by the use of caustics and the sludge deposited in a chemical waste landfill. Recommendable methods: Precipitation, solidification, landfill, discharge to sewer, & incineration. Peer-review: Precipitate copper with alkali, filter, solidify precipitate. (Do not use ammonia as alkali). Cation exchange will allow recovery of copper. Eluate from cation exchanger can be passed through anion exchanger to remove (or reduce) naphthenic acid content. Exhausted ion exchange resins can be landfilled. (Peer-review conclusions of an IRPTC expert consultation)
Cupric hydroxide Preparation Products And Raw materials
- Sodium hydroxide Copper(I) Cyanide Magnesium hydroxide INDIUM HYDROXIDE Iron hydroxide Cesium hydroxide Zinc hydroxide STRONTIUM HYDROXIDE OCTAHYDRATE Cesium hydroxide Aluminum hydroxide [(R,R)-1,5-DIAZA-CIS-DECALIN]COPPER HYDROXIDE IODIDE HYDRATE Cupric oxalate CUPRIC PALMITATE COPPER(II) ETHOXIDE MONO-N-BUTYL PHTHALATE COPPER(II) SALT Copper benzoate COPPER (II) TRIFLUOROACETATE Cupric stearate
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