Copper hydroxide, molecular formula Cu(OH)2, dry powder […]
Copper hydroxide, molecular formula Cu(OH)2, dry powder exhibits blue or crystal, slightly toxic, used as an analytical reagent, and also used in medicine, pesticides, and the like. Can be used as catalysts, mordants, pigments, feed additives, paper stains, swimming pool disinfectants, etc. It is also a weak oxidant.
Copper hydroxide is a blue flocculent precipitate, hardly soluble in water, decomposed by heat, slightly bisexual, soluble in acid, ammonia and sodium cyanide, easily soluble in alkaline glycerin solution, heated to 60-80 °C Dark, the temperature is further decomposed into black copper oxide and water.
Copper hydroxide has been known since the beginning of molten copper. Alchemists of 5000 BC may already know about copper hydroxide. Copper hydroxide can be obtained by simply mixing the blue hydrazine with the lye.
Copper hydroxide is present in a variety of minerals such as azurite, malachite, agglomerates and water cholesteria. The azurite and malachite are basic carbonates, and the block copper and water cholesterium are basic sulfates. Copper hydroxide is rarely present alone because it is easily decomposed and reacts slowly with carbon dioxide in the air to form basic copper carbonate. The mineral copper hydroxide present alone is called a copper sulphite.
Physical and chemical properties:
The fatty aldehyde can react with copper hydroxide, the aldehyde is oxidized, the copper hydroxide is reduced, the valence of Cu decreases from positive to positive, and the valence of C in the aldehyde group increases.
However, it is necessary to pay special attention to the fact that the aromatic aldehyde Ar-CHO is generally not oxidized by copper hydroxide! This method can be used to distinguish between aromatic aldehydes and fatty aldehydes.
Basic Copper hydroxide plays an important role in organic synthesis. It is usually formed from a copper salt and potassium hydroxide and reacted in situ.