276 mg/kg (rat, oral)

decompose

58.7 g/100 mL (anhydrous)
very soluble (pentahydrate) in water

''anhydrous''
soluble in acetone
slightly soluble in ethanol
insoluble in ether

---

''pentahydrate''
soluble in alcohol, ether

brown-red powder

4.303 g/cm³ (anhydrous)
2.43 g/cm³ (pentahydrate)

370 °C, decomposes