Sodium hydroxide, also known as caustic soda, caustic soda, caustic soda, or caustic soda, is an inorganic compound with the chemical formula NaOH and a relative molecular weight of 39.9970.

Sodium hydroxide has strong alkalinity and strong corrosiveness. It can be used as an acid neutralizer, a masking agent, a precipitant, a precipitation masking agent, a coloring agent, a saponification agent, a peeling agent, a detergent, etc. It has a wide range of applications.

physical property:

Density: 2.130 g/cm ³

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: soluble in water, ethanol, glycerol, insoluble in acetone, ether

chemical property:

Sodium hydroxide has a corrosive effect on fibers, skin, glass, ceramics, etc. It releases heat when dissolved or diluted in concentrated solutions; Neutralization reaction with inorganic acids can also generate a large amount of heat, resulting in the formation of corresponding salts; Reacting with metallic aluminum and zinc, non-metallic boron and silicon to release hydrogen; Disputation reaction occurs with halogens such as chlorine, bromine, iodine, etc. Can precipitate metal ions from aqueous solutions into hydroxides; The principle of removing oil stains from fabrics is to cause saponification reaction of oils and fats, generating corresponding sodium salts and alcohols of organic acids.