Characteristics:
White exiguous acicular or oblique-pillar crystal. Smell-less, taste-bitter. Easily efflorescent at dry air. Specific gravity is 1.68.Freely soluble in water. Soluble in its own water at 67.5℃.Slightly soluble in ethanol and glycerin. Decomposing is heated up . Lossing 4 crystal water at 70-80℃.about at 200℃, lossing all of its crystal water becomes anhydrous compounds.