Hydroxyde de sodium(Soda caustique, soda caustique, soda caustique, flocons de soda caustiques)

Hydroxyde de sodium, également connu sous le nom de soda caustique, soda caustique, soda caustique, et flocons de soda caustique, is an inorganic compound with the chemical formula NaOH and a relative molecular weight of 39.9970.

Physical properties
Density: 2.130 g/cm³
Melting point: 318.4℃(591 K)
Boiling point: 1390℃ (1663 K)
Vapor pressure: 24.5mmHg(25°C)
Saturated vapor pressure: 0.13 Kpa (739℃)
Appearance: white crystalline powder
Solubility: easily soluble in water, ethanol, glycerol, insoluble in acetone, ether

Chemical properties
Sodium hydroxide is corrosive to fibers, skin, glass, ceramics, etc. It releases heat when dissolved or diluted as a concentrated solution; it can also generate a lot of heat when it reacts with inorganic acids to generate corresponding salts; it reacts with metal aluminum and zinc, non-metal boron and silicon to release hydrogen; it reacts with halogens such as chlorine, bromine, and iodine to undergo disproportionation reactions. It can precipitate metal ions from aqueous solutions to form hydroxides; it can cause oils and fats to undergo saponification reactions to generate corresponding organic acid sodium salts and alcohols, which is the principle of removing oil stains from fabrics.