4.5 (hexahydrate)

yellow solid (anhydrous)
green-blue crystals (hexahydrate)
blue crystals (heptahydrate)

4.01 g/cm³ (anhydrous)
2.07 g/cm³ (hexahydrate)
1.948 g/cm³ (heptahydrate)

Non-flammable

65 g/100 mL (20 °C)
77.5 g/100 mL (30 °C) (heptahydrate) in water

''anhydrous''
insoluble in ethanol, ether, acetone

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''hexahydrate''
very soluble in ethanol, ammonia

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''heptahydrate''
soluble in alcohol

1.511 (hexahydrate)
1.467 (heptahydrate)

odorless

840 °C (anhydrous, decomp)
100 °C (hexahydrate, decomp)

Dangerous for the environment (N)

Harmful (Xn)

Toxic (T)

Carc. Cat. 1

Muta. Cat. 3

Repr. Cat. 2

Irritant (Xi)

R49,R61,R20/22,R38,R42/43,R48/23,R68,R50/53

S53,S45,S60,S61

QR9600000

264 mg/kg

028-009-00-5