Physical
Density: 2.130 g/cm³
Melting Point: 318.4 °C (591 K)
Boiling Point: 1390 °C (1663 K)
Vapor pressure: 24.5mmHg (25°C)
Saturation vapor pressure: 0.13 Kpa(739°C)
Appearance: White crystalline powder
Solubility: Soluble in water, ethanol, glycerol, insoluble in acetone, ether
Chemical properties
Sodium hydroxide has a corrosive effect on fibers, skin, glass, ceramics, etc., and will release heat when dissolved or diluted in concentrated solution; The neutralization reaction with inorganic acids can also produce a large amount of heat to generate the corresponding salts; Hydrogen is released by reacting with metal aluminum and zinc, non-metal boron and silicon; It disproportionates with halogens such as chlorine, bromine, and iodine. It can precipitate metal ions from aqueous solution to become hydroxides; It can make the oil saponification reaction to generate sodium salt and alcohol of the corresponding organic acid, which is the principle of removing oil stains on the fabric.
