Copper rust is insoluble in water, but soluble in ammonia water, forming copper-ammonia complex ions. When heated to 220℃, it will decompose. Basic copper carbonate is sky blue powder crystal with a composition of 2∶ 1.
If it is left in the air for a long time, it will absorb water, release part of carbon dioxide, and gradually become 1∶ 1 basic copper carbonate, which is insoluble in water and soluble in ammonia water to form cuprammonia complex ions.
Extended data:
Electrolytic copper reacts with concentrated nitric acid to produce copper nitrate, and then reacts with the mixed solution of sodium carbonate and sodium bicarbonate to produce basic copper carbonate. The precipitate is washed, separated, dehydrated and dried to obtain the finished product of basic copper carbonate.
Using copper nitrate and sodium carbonate as raw materials, the aqueous solution of copper nitrate trihydrate and sodium carbonate with the same amount of substances is prepared, and the blue-green colloidal precipitate is generated while mixing, and the crystalline substance can be generated by continuous stirring at room temperature, filtered and dried. A product with a composition of can be obtained.