Copper(II) acetate

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Copper(II) acetate
Names:	copper(II) acetate copper diacetate cupric acetate copper(II) ethanoate verdigris Paris green PubChem: 8895 CAS: 142-71-2 CAS: 52503-64-7 InChI Key: OPQARKPSCNTWTJ-UHFFFAOYSA-L
Formula:	Cu(CH3COO)2 (anhydrous) Cu(CH3COO)2 · H2O (monohydrate)
SMILES:	CC(=O)[O-].CC(=O)[O-].[Cu+2]
Molar mass:	181.634 g/mol (anhydrous) 199.649 g/mol (monohydrate)
Density:	1.93 g/cm3 (anhydrous) 1.882 g/cm3 (monohydrate)
Crystal system:	triclinic (monohydrate)
Shapes:	https://media.crystalls.info/w/uploads/media/Octahedron.json Octahedron https://media.crystalls.info/w/uploads/media/Truncated_octahedron.json Truncated octahedron https://media.crystalls.info/w/uploads/media/Prolongated_octahedron.json Prolongated octahedron
Color:	dark-blue dark-green black
Refractive index:	1.545 (monohydrate)
Magnetic properties:	paramagnetic
Stability:	slightly erodes (monohydrate)
Hardness:	very fragile
Toxicity:	slightly toxic LD50=710mg/kg

Description

Organic compound, salt of bivalent transitional metal copper and organic acetic acid. From water solutions crystallizes as monohydrate.

Minerals

Occurs in nature as hoganite mineral.

Precursors

Reaction between copper(II) hydroxycarbonate, hydroxide or oxide and acetic acid

Chemical equation:

4CH₃COOH + Cu₂CO₃(OH)₂ = 2Cu(CH₃COO)₂ + 3H₂O + CO₂↑

2CH₃COOH + Cu(OH)₂ = Cu(CH₃COO)₂ + 2H₂O

2CH₃COOH + CuO = Cu(CH₃COO)₂ + H₂O

For preparation of 100.00g of copper(II) acetate monohydrate

monohydrate

anhydrous

а 55.38g of hydroxycarbonate or 48.87g of hydroxide or 39.84g of oxide and 85.94g of 70%

70%

30%

9%

acetic acid is required.

Add acid to the flask, then add small parts of copper compound with stirring until it will totally dissolve or, if you use carbonate, until carbon dioxide emission will stop. After reaction will stop, filter the solution and use it for crystal growing.

Reaction between metal copper, acetic acid and hydrogen peroxide

Chemical equation:

2CH₃COOH + Cu + H₂O₂ = Cu(CH₃COO)₂ + 2H₂O

For preparation of 100.00g of copper(II) acetate monohydrate

monohydrate

anhydrous

а 31.83g of copper, 567.90g of 3%

3%

30%

peroxide and 85.94g of 70%

70%

30%

9%

acetic acid is required.

Add hot acid solution to the flask, then add peroxide and copper pieces, shavings or powder and stir and heat it until gas emission will stop.

Electrolysis of acetic acid solution with copper anode

Chemical equation:

2CH₃COOH + Cu —electrolysis→ Cu(CH₃COO)₂ + H₂↑

For preparation of 100.00g of copper(II) acetate monohydrate

monohydrate

anhydrous

а 31.83g of copper and 85.94g of 70%

70%

30%

9%

acetic acid is required.

Add to the flask acetic acid solution, then place there copper electrodes and plug them to 1.5-5 V power supply. After some time crystal growth will begin at cathode.

Reaction between copper(II) chloride, sulfate or nitrate and excess of concentrated acetic acid

Chemical equation:

2CH₃COOH + CuCl₂ = Cu(CH₃COO)₂↓ + 2HCl

2CH₃COOH + CuSO₄ = Cu(CH₃COO)₂↓ + H₂SO₄

2CH₃COOH + Cu(NO₃)₂ = Cu(CH₃COO)₂↓ + 2HNO₃

For preparation of 100.00g of copper(II) acetate monohydrate

monohydrate

anhydrous

а 85.39g of copper(II) chloride dihydrate

dihydrate

anhydrous

or 125.06g of copper(II) sulfate pentahydrate

pentahydrate

anhydrous

or 148.08g of copper(II) nitrate hexahydrate

hexahydrate

anhydrous

and 60.16g of glacial

glacial

70%

acid acetic is required.

Add to the flask with hot copper compounds solution a acid solution with heating and stirring. Cooling this mixture will cause forming a large amount of crystalline precipitate. Filter precipitate and wash it wish small amount of glacial acetic acid, then filter the solution and use it for crystal growing.

Reaction between copper(II) nitrate and sodium acetate

Chemical equation:

2NaCH₃COO + Cu(NO₃)₂ = Cu(CH₃COO)₂↓ + 2NaNO₃

For preparation of 100.00g of copper(II) acetate monohydrate

monohydrate

anhydrous

а 148.08g of copper(II) nitrate hexahydrate

hexahydrate

anhydrous

and 136.32g of sodium acetate trihydrate

trihydrate

anhydrous

is required.

Add to the flask with hot copper(II) nitrate solution a sodium acetate solution with heating and stirring. Cooling this mixture will cause forming a large amount of crystalline precipitate. Filter precipitate and wash it wish small amount of cold water, then filter the solution and use it for crystal growing.

Reaction between copper(II) sulfate and calcium or lead(II) acetate

You can use copper(II) chloride instead of sulfate if you use lead salt..
Chemical equation:

Ca(CH₃COO)₂ + CuSO₄ = Cu(CH₃COO)₂ + CaSO₄↓

Pb(CH₃COO)₂ + CuSO₄ = Cu(CH₃COO)₂ + PbSO₄↓

Pb(CH₃COO)₂ + CuCl₂ = Cu(CH₃COO)₂ + PbCl₂↓

For preparation of 100.00g of copper(II) acetate monohydrate

monohydrate

anhydrous

а 103.44g of copper(II) chloride tetrahydrate

tetrahydrate

anhydrous

or 125.06g of copper(II) sulfate pentahydrate

pentahydrate

anhydrous

and 88.25g of calcium acetate monohydrate

monohydrate

anhydrous

or 190.00g of lead(II) acetate trihydrate

trihydrate

anhydrous

is required.

Add to the flask with calcium or lead acetate solution small parts of copper salt solution and stir. The large amount of poorly soluble precipitate will form. Settle it out and discard, then filter the solution carefully.

Influence of temperature

Growing at higher temperatures does not influence on growing speed but leads to compound hydrolysis.

Influence of impurities

Iron salts leads to obtaining polycrystalline, excrescences at main crystal and solution container walls and also to changing its color to dark-green.
Small addition of acetic acid is recommended for preventing hydrolysis and precipitation.
Addition of salts having different crystal lattice and non-reactive with compound - such as ammonium acetate, sodium acetate or sulfate - can increase the transparency of the solution and improve the shape of the crystals formed.

Storage conditions

Store in its original form or under several layers of varnish at average humidity and room temperature. Do not store in matchboxes or cotton wool and do not heat.

Solubility

TableGraph

Temperature	гр/100,00 гр water		гр/100,00 гр ethanol	гр/100,00 гр methanol	гр/100,00 гр acetone	гр/100,00 гр glycerol	гр/100,00 гр pyridine	гр/100,00 гр acetic acid
	(anhydrous)	(monohydrate)	(monohydrate)	(anhydrous)	(anhydrous)	(anhydrous)	(anhydrous)	(anhydrous)
15°C288.15 K <br />59 °F <br />518.67 °R <br />				0.48	0.28	10	1.04
20°C293.15 K <br />68 °F <br />527.67 °R <br />	~6.5	7.2
25°C298.15 K <br />77 °F <br />536.67 °R <br />	6.79		7.14					0.512
30°C303.15 K <br />86 °F <br />545.67 °R <br />	~6.99							0.925
40°C313.15 K <br />104 °F <br />563.67 °R <br />	~7.38
50°C323.15 K <br />122 °F <br />581.67 °R <br />	~7.78
60°C333.15 K <br />140 °F <br />599.67 °R <br />	~8.17
70°C343.15 K <br />158 °F <br />617.67 °R <br />	~8.57
80°C353.15 K <br />176 °F <br />635.67 °R <br />	~8.96	20
90°C363.15 K <br />194 °F <br />653.67 °R <br />	~9.36
100°C373.15 K <br />212 °F <br />671.67 °R <br />	9.75

Soluble in diethyl ether. Slightly soluble in acetone. Insoluble in DMSO.

Gallery

• 

  Crystals obtained by dissolving copper in acid with the presence of air, grown in 2 yearsCopper(II) acetate, Pok, Sciencemadness forumPokSciencemadness forum

• 

  Crystals obtained by dissolving copper in acid with the presence of air, grown in 2 yearsCopper(II) acetate, Pok, Sciencemadness forumPokSciencemadness forum

• 

  Growth for 5 yearsCopper(II) acetate, Pok, Sciencemadness forumPokSciencemadness forum

• 

  Copper(II) acetateDmitry Shintyakov, Personal crystal growing collectionDmitry ShintyakovPersonal crystal growing collection

• 

  Growth over yearCopper(II) acetate, Yaroslav Zavada, VKontakteYaroslav ZavadaVKontakte

• 

  Growth over yearCopper(II) acetate, Yaroslav Zavada, VKontakteYaroslav ZavadaVKontakte

• 

  Growth over yearCopper(II) acetate, Yaroslav Zavada, VKontakteYaroslav ZavadaVKontakte

• 

  Copper(II) acetateVladimir Semikin, VKontakteVladimir SemikinVKontakte

Sources

• R.A.Kiper Properties of compounds. Handbook
• R.A.Kiper Properties of compounds. Handbook
• P. Vogel
• D.Semenok, Synthesis and purification of copper catalyzers

Navigation

Copper compounds
Salts	Copper (Cu) • Copper(II) acetate (Cu(CH3COO)2) • Copper(II) dihydrophosphate (Cu(H2PO4)2) • Copper(II) formate (Cu(COOH)2) • Copper(II) lactate (Cu(C3H5O3)2) • Copper(II) nitrate (Cu(NO3)2) • Copper(II) sulfamate (Cu(NH2SO3)2) • Copper(II) sulfate (CuSO4) • Copper(II) tartrate (CuC4H4O6) • Copper(II) chloride (CuCl2)
Double salts	Copper-calcium acetate (CuCa(CH3COO)4) • Copper(II)-iron(II) sulfate ((Cu,Fe)SO4) • Copper(II)-ammonium sulfate ((NH4)2Cu(SO4)2) • Copper(II)-potassium sulfate (K2Cu(SO4)2)
Complexes	Dicarbonatocuprates • Dioxalatocuprates • Bis-thetramethylethylenediaminecopper(II) nitrate ([Cu((H3CNCH3)2C4H8)](NO3)2) • Glycinecopper(II) sulfate ([Cu(NH2CH2COOH)]SO4) • Potassium dioxalatocuprate(II) (K2[Cu(C2O4)2]) • Sodium dioxalatocuprate(II) (Na2[Cu(C2O4)2]) • Sodium dicarbonatocuprate(II) (Na2[Cu(CO3)2]) • Tetraamminecopper(II) sulfate ([Cu(NH3)4]SO4) • Tetrachlorocuprates • Tris(hydroxymethyl)methanoaminecopper(II) sulfate ([Cu(NH2C(CH2OH)3)4]SO4)