Copper Carbonate

Copper Carbonate also known as cupric carbonate is the artificial malachite. Cu2(OH)2CO3, toxic, green powder which is soluble in acids but insoluble in water, decomposes at 200 degree C and its specific gravity is 3.90. It is used in pigments and pyrotechnics and as a feed additive and fungicide; antidote for phosphorous poisoning.

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Detailed Description for Copper Carbonate

Copper Carbonate also known as cupric carbonate is the artificial malachite. Cu2(OH)2CO3, toxic, green powder which is soluble in acids and decomposes at 200 degree C; used in pigments and pyrotechnics and as a feed additive and fungicide; antidote for phosphorous poisoning.

Basic copper carbonate usually refers to the compound (Cu2(OH)2CO3) (the mineral malachite). Sometimes this name is used for Cu3(OH)2(CO3)2 (the associated mineral azurite). Malachite and azurite can be found in the verdigris patina that is originated on weathered brass, bronze and copper. Thus the composition of the patina can vary, in a marine environment depending on the environment a basic chloride may be present and in an urban environment basic sulfates may also be present.

The compound Copper(II) carbonate CuCO3 is not known to happen naturally.

Basic copper carbonate is formed by combining aqueous solutions of copper (II) sulfate and sodium carbonate. Copper carbonate will precipitate from the solution:

2 CuSO4 + 2 Na2CO3 + H2O Cu2(OH)2CO3 + 2 Na2SO4 + CO2

The formation of basic copper carbonate can be verified in the subsequent steps: a) Centrifuge (or filter) the above mentioned solution; 1 min at 6000 g is sufficient b) Precipitate is washed with distilled water and then centrifuge or filter again c) The colour of the precipitate is blue, like that of numerous copper salts but none of the sodium salts d) If dilute (1M) hydrochloric acid is added, then bubbles of CO2 will emerge and then the precipitate will be fully solubilised. These won’t be formed if dilute hydrochloric acid was added to solid Na2SO4.

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE

Green powder, odorless

MELTING POINT

200 degree C (Decomposes)

 

 

SPECIFIC GRAVITY

3.90

SOLUBILITY IN WATER

Insoluble

pH

 

 

 

log P

-2.76 (Octanol-water)

OH RATE CONSTANT

2.80E-13 (cm3/molecule-sec at 25 degree C Atmospheric)

AUTOIGNITION

 

NFPA RATING

Health: 2, Flammability: 0, Reactivity: 0

 

 

FLASH POINT

Not considered to be a fire hazard

STABILITY

Stable under ordinary conditions

 

Index

standard

(Cu)
Copper

≥55%

(Pb)
Lead

≤0.005%

(Cl)
Chlorin

≤0.03%

(S)
Sulphur

≤0.05%

(Na)
Sodium

≤0.2%

(As)
Arsenic

≤0.003%

(Fe)
Ferric

≤0.03%

Hydrochloric acid insoluables

≤0.1%

Moisture

≤0.5%

 

Uses:

Both azurite and malachite basic copper carbonates have been used as pigments. It has also been used in some types of make-up such as lipstick, although it can also be toxic to humans. It also has been used for several years as an effective algaecide in farming ponds and in aquaculture operations

 

 


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