1.650 (anhydrous)
1.594 (dihydrate)
1.536 (hexahydrate)

ethanol: very slightly soluble
acetone: very slightly soluble
ammonia: insoluble

anhydrous:
53.8 g/100 mL (20 °C)

---

hexahydrate:
106 g/100 mL (0 °C)
206 g/100 mL (40 °C) in water

White crystalline solid

1250 °C (anhydrous)

Non-flammable

874 °C (anhydrous)
61 °C (hexahydrate)

3.052 g/cm³ (anhydrous, monoclinic form)
2.672 g/cm³ (dihydrate)
1.930 g/cm³ (hexahydrate)

Not listed

Irritant