Nature: Colorless transparent crystal. Density 1.45 grams/centimeters 3. Melting point 58℃. 123℃ when loses the crystal water. Anhydrous substance density 1.528 grams/centimeters 3, melting point 324℃. Dissolves in the water, assumes the weak basicity. Dissolves slightly in the ethyl alcohol. Also calls “the hot ice”. Facture: By sodium carbonate or sodium hydroxide and acetic acid function, but makes; Also available wood naphtha sideline product vinegar stone and sodium carbonate function system.