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Basic copper carbonate.

Basic copper carbonate has the chemical formula Cu2CO3(OH)2, also known as malachite, which is a precious mineral gemstone. It is a substance produced by the reaction of copper with substances such as oxygen, carbon dioxide and water in the air, also known as patina, and its color is emerald green. When heated in air, it decomposes into copper oxide, water, and carbon dioxide.

Copper carbonate and copper bicarbonate do not actually exist. Basic copper carbonate precipitates can be obtained by adding sodium carbonate to a dilute copper sulfate solution or by passing carbon dioxide into a copper hydroxide suspension. Basic copper carbonate can be regarded as composed of copper hydroxide and copper carbonate, and there are actually two kinds of copper hydroxide combined, one copper carbonate and copper hydroxide combined with two copper carbonates.

The chemical formula of the former is CuCo3·Cu(OH)2, which is a grass-green monoclinic crystalline fibrous agglomerate, or dark green powder. The precipitate obtained from the solution initially appears green, and after being placed, it turns dark green in the solution. It is toxic and is the main component of the green rust (commonly known as patina) that forms on the surface of copper.

It is also found in nature in the form of a mineral and is commonly known as malachite. It is insoluble in water, soluble in acid, and decomposes into copper oxide, water and carbon dioxide when heated to 220 in hot water. It dissolves in acid and generates the corresponding copper salt.

It is also soluble in aqueous solutions of cyanide, ammonium salts and alkali metal carbonates to form a complex of copper. The latter has the chemical formula 2CuCO3·Cu(OH)2, deep sky blue, very bright monoclinic crystals, or tight crystalline agglomerates. It is insoluble in water, soluble in ammonia and a hot and concentrated solution of sodium bicarbonate to form blue, and decomposes at 300.

Basic copper carbonate can be used to make signal flares, pyrotechnics, paint pigments, pesticides and antidotes, as well as in electroplating.

Chemical Name: Basic Copper Carbonate (There are two compounds, CuCO3·Cu(OH)2 and.

Chemical Description:

Molecular weight. Aesthetically pleasing green powdery crystals. Relative density, refractive index

909, decompose when heated to 220. Insoluble in water and ethanol, soluble in acid to form the corresponding copper salt, soluble in aqueous solution of cyanide, ammonia, ammonium salt and alkali metal carbonate to form a copper complex. When boiled in water or heated in a strong alkaline solution, brown copper oxide can be formed.

It can react with hydrogen sulfide to form copper sulfide. It occurs in nature in the form of malachite.

Preparation method: It is obtained by adding boiling water to precipitate by mixing copper sulfate and sodium bicarbonate finely.

Uses: used in the manufacture of paint pigments, pyrotechnics, pesticides, other copper salts and solid phosphor activators, etc., also used in seed treatment and fungicides.

Molecular weight, blue monoclinic crystals, relative density, refractive index838, heat to 200 decomposition. Insoluble in water, soluble in ammonia to form ammonia complexes of divalent copper.

When left in the air for a long time, it absorbs moisture and releases carbon dioxide, which slowly turns into green malachite. Found in nature in the form of azurite.

Preparation method: It is obtained by the reaction of copper nitrate solution and calcium carbonate.

Uses: Used as pigment.

There are two answers, because a b so a can only be equal to -8, and b can be equal to 3 or it can be equal to -3 so the answer is -5 or -11

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