colorless solid
hygroscopic

2.504 g/cm³ (anhydrous)
1.896 g/cm³ (tetrahydrate)

6.0

decomposes (anhydrous)
132 °C (tetrahydrate)

561 °C (anhydrous)
42.7 °C (tetrahydrate)

Non-flammable

dissolves in alcohol and acetone
soluble in ammonia
almost insoluble in nitric acid

anhydrous:
121.2 g/100 mL (20 °C)
271.0 g/100 mL (40 °C)

---

tetrahydrate:
195 g/100 mL (0 °C)
129 g/100 mL (20 °C)
363 g/100 mL (100 °C) in water

EW2985000

1454

302 mg/kg (rat, oral)

Not listed