Why is copper oxide insoluble in ethanol

Copper (II) acetate Cu (CH3COO) 
Green to blue-green
molar mass  181,635 
(Monohydrate 199.650 g / mol)

AGW 0.01 mg / m3 A (MAK)
density Monohydrate 1.88 g / cm3   
decomposition + 240 ° C
Water solubility  
Conc. At 20 ° C 72 g / l
GHS 05
GHS 07
GHS 09
Hazard classes + category 
Acute toxicity oral 4
Skin corrosion 1B
Hazardous to the aquatic environment chronic / acute 1
HP rates (see note)  
H 302, 314, 400, 410
P 264.1, 273, 280.1-3, 301 + 312,305 + 351 + 338
disposal G 3
print a labelGerman designation 
Synonyms (German)
English designation 
CAS 142-71-2Copper (II) acetate 
Copper (II) ethanoate
Copper (II) - acetate 
Copper (II) - ethanoate 
CAS 6046-93-1Copper (II) acetate monohydrate * 
Copper (II) ethanoate monohydrate
Copper (II) - acetate monohydrate 
Copper (II) - ethanoate monohydrate
*) Preferred for school
Copper (II) acetate monohydrate is a chemical compound that is soluble in water and in ethanol. It gradually weathers in the air and loses its water of crystallization when heated to over 100 ° C, at 240 ° C it decomposes into acetic acid and elemental copper. This can be shown by heating a small amount of copper (II) acetate in a test tube over the burner flame:


When heating copper (II) acetate in a test tube
copper and acetic acid are produced.

"Verdigris" is a mixture of several basic copper acetates. It occasionally forms on copper vessels when they come into contact with vinegar. However, verdigris should not be confused with the green layers of a patina (for details see under copper).

Copper (II) acetate is formed from dilute acetic acid and copper.

For production in the laboratory, a larger strip of sheet copper is placed in vinegar essence (25% acetic acid) so that half of the strip protrudes from the liquid and is in contact with the air. Over the course of several days, beautiful, blue-green crystals of copper (II) acetate form on the copper sheet:
2 Cu + 4 CH3COOH + O2  2 Cu (CH3COO)2 + 2 H.2O
Copper (II) acetate can be used as a blue-green color pigment. It is also an important intermediate in the production of the highly toxic pigment Schweinfurter Grün. This arsenic compound may no longer be used in paints today. Since copper (II) acetate kills fungi, it is suitable as a fungicide.
Experiment with copper acetate