The chemical formula of basic copper carbonate is Cu2(OH)2CO3, which is emerald green in color. Copper usually exists in the form of this compound in nature. It is a substance produced by the reaction of copper with oxygen, carbon dioxide, water and other substances in the air. Insoluble in water. Basic copper carbonate is often referred to as patina or patina.
Introduction to basic copper carbonate and malachite
The crystal of basic copper carbonate is malachite, which is a precious mineral gem.
2Cu + O2+ CO2+ H2O → Cu2(OH)2CO3
Introduction to properties and stability of basic copper carbonate
Characteristics: peacock green fine amorphous powder. Insoluble in water and alcohol. Soluble in acid, ammonia and potassium cyanide solution.
Stable under normal temperature and pressure.
Avoid materials that are acidic. Insoluble in cold water and alcohol, hydrated terbium carbonate decomposes in hot water and dissolves in acid to form the corresponding copper salt. Soluble in cyanide, ammonia, ammonium salt and alkali metal carbonate solutions to form copper complexes. Brown copper oxide forms when boiled in alkali metal carbonate solutions. Unstable to hydrogen sulfide. Heated to 200°C, it decomposes black copper oxide, water (small water droplets formed by condensation when exposed to cold) and carbon dioxide. Unstable in hydrogen sulfide gas. Solubility in water is 0.0008%. Copper carbonate is dusty, so contact with skin, eyes, etc. and inhalation should be avoided.
Insoluble in water, soluble in ammonia water to form copper ammonia complex ions. Decomposes when heated to 220°C. Basic copper carbonate with a composition of 2:1 is sky blue powdery crystal. If left in the air for a long time, it will absorb moisture and release part of carbon dioxide, and slowly turn into 1:1 basic copper carbonate, which is insoluble in water, but soluble in ammonia to form copper ammonia complex ions.
Introduction to the uses of basic copper carbonate
Basic copper carbonate is used in catalysts, fireworks, pesticides, pigments, feeds, fungicides, electroplating, anti-corrosion and other industries and in the manufacture of copper compounds
Used as analytical reagents and pesticides
Basic copper carbonate is used in organic catalysts, pyrotechnics manufacturing and pigments. In agriculture, it is used as a preventive agent for plant smut, a pesticide, an antidote for phosphorus poisoning, and a fungicide for seeds; mixed with asphalt to prevent livestock and wild rats from chewing saplings; used as a copper additive in feed , used as dealkalizing agent and raw material for producing copper compounds during crude oil storage. It can also be used for electroplating, anti-corrosion and analytical reagents.
Battery grade lithium carbonate
Used in paint colors, fireworks, insecticides, seed treatment fungicides, preparation of other copper salts, solid phosphor activators.
Introduction to preparation of basic copper carbonate
Prepared by the action of sodium carbonate and copper sulfate
Reaction equation: 2Na2CO3+ 2CuSO4+ H2O → Cu2(OH)2CO3↓ + CO2↑ + 2Na2SO4
Specific method:
According to the volume ratio V (CuSO4): V (Na2CO3) = 1:1.2, take 0.5mol/L sodium carbonate solution and 0.5mol/L copper sulfate solution, and place them in a water bath at 70°C until the temperature is constant. Then mix the two and stir in a water bath environment of 70°C. A light blue precipitate can be observed. Adjust the pH value to 8.50~8.88, and stir the suspension continuously until the precipitate turns green. Stop stirring at this time and let it stand. After the precipitate settles, filter it and wash the precipitate with deionized water until there is no sulfate ion (sodium sulfate). The precipitate is then dried in an oven at 100°C to obtain green basic copper carbonate.
Prepared by the action of sodium bicarbonate and copper sulfate
Reaction equation: 2CuSO4+ 4NaHCO3→ Cu2(OH)2CO3↓ + 3CO2↑ + H2O + 2Na2SO4
Introduction to the decomposition of basic copper carbonate
Cu2(OH)2CO3→2CuO+CO2+H2O
Introduction to basic copper carbonate rust removal
Basic copper carbonate is put into dilute sulfuric acid to produce copper sulfate, water and carbon dioxide. Reaction:
Cu2(OH)2CO3+ 2H2SO4→ 2CuSO4+ CO2↑ + 3H2O
Basic copper carbonate will decompose into copper oxide, water and carbon dioxide when heated. Reaction formula: Cu2(OH)2CO3→2CuO+CO2+H2O
