Traits: colorless crystalline columnar or granular. A bitter salty.
1.67 relative density. Weathering in dry air. Room temperature, the
loss of part of crystal water, 70 ~ 80 ℃ crystal water loss of 4 elements, 100 ℃ lost 5 crystal water molecules, 120 ℃ lost 6 crystal water molecules, 250 ℃ become anhydrous material. Melting point 1124 ℃. Soluble in water, slightly soluble in ethanol, glycerin,
insoluble in acetone.
Uses: used as analytical reagent, such as the precipitant so
sulfate. Also used in medicine, printing and dyeing, paper making,
ceramics and leather industry.