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There are two kinds: crystalline and anhydrous. White or nearly white, or slightly colored. As shiny pellets, tablets, rods, blocks or other shapes. Pure is a colorless transparent crystal, relative Density2.130, Melting point318.4 ℃, Boiling point1390 ℃. Exposed to the air is hygroscopic and finally completely dissolved into a liquid. Soluble in water and strongly exothermic, was strongly alkaline aqueous solution, there is a strong corrosive. pH of 4% aqueous solution at 14. Can also soluble in methanol, ethanol, glycerin, insoluble in ether, acetone. Easy to absorb carbon dioxide from the air and gradually turned into sodium carbonate. In addition, liquid Sodium hydroxide products.
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