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20427-59-2

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Identification

Name
Cupric hydroxide
CAS
20427-59-2
Synonyms
COPPER(+2)HYDROXIDE
copper dihydroxide
COPPER HYDRATE
COPPER HYDROXIDE
COPPER(II) HYDROXIDE
CUPRIC HYDROXIDE
Kocide 101
Chiltern kocide 101
Comac
Comac parasol
comacparasol
Copper hydrate, hydrated cupric oxide
Copper hydroxide (Cu(OH)2)
Copper hydroxide (ic)
Copper oxide hydrated
copperhydroxide(cu(oh)2)
copperoxidehydrated
Cu(OH)2
cudroxtechnical
Cupravit blau
EINECS(EC#)
243-815-9
Molecular Formula
CuH2O2
MDL Number
MFCD00010968
Molecular Weight
97.56
MOL File
20427-59-2.mol

Chemical Properties

Appearance
Blue powder
Appearance
Blue, gelatinous or amorphous powder. Insoluble in water.
storage temp. 
0-6°C
Stability:
Stable, but hygroscopic. Store in dry conditions.
Sensitive 
Hygroscopic
Merck 
14,2642
CAS DataBase Reference
20427-59-2(CAS DataBase Reference)
NIST Chemistry Reference
Copper hydroxide(20427-59-2)
EPA Substance Registry System
20427-59-2(EPA Substance)

Safety Data

Hazard Codes 
Xn
Risk Statements 
R22:Harmful if swallowed.
R37/38:Irritating to respiratory system and skin .
R41:Risk of serious damage to eyes.
Safety Statements 
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36:Wear suitable protective clothing .
RIDADR 
3262
WGK Germany 
3

RTECS 
GL7600000

HS Code 
28255000
Hazardous Substances Data
20427-59-2(Hazardous Substances Data)

Raw materials And Preparation Products

Material Safety Data Sheet(MSDS)

Hazard Information

Hazard
Toxic by ingestion and inhalation.
Potential Exposure
Inorganic copper fungicide, nematicide, and microbiocide
First aid
If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions) if breathing has stopped, and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medical attention. If victim is conscious and able to swallow, have victim drink 4 to 8 oz of water. Do not induce vomiting.
Shipping
UN3077 Environmentally hazardous substances, solid, n.o.s., Hazard class: 9; Labels: 9-Miscellaneous hazardous material, Technical Name Required.
Incompatibilities
Reacts with calcium (metal hydroxides), nitroethane, nitromethane, 1-nitropropane, zirconium
Waste Disposal
Copper-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)

Questions And Answer

Description
Cupric 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.
Copper(II) hydroxide
Furthermore, cupric hydroxide is used in the wood preservative products in aqueous systems.
Chemical Properties
Copper(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.
Uses
Copper(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.
Preparation
Copper(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
[1] Michael Ash, Handbook of Preservatives, 2004
[2] Günter Joseph and Konrad J. A. Kundig, Copper: Its Trade, Manufacture, Use, and Environmental Status, 1999
[4] 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
[5] George B. Kauffman, Rayon: The first semi-synthetic fiber product, Journal of Chemical Education, 1993, vol. 70, 887

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