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Copper(II) sulfate
IUPAC name	Copper(II) sulfate pentahydrate
Other names	Copper(II) sulfate Copper(II)sulfate Cupric sulfate Blue vitriol Bluestone Chalcanthite
Identifiers
CAS number	[7758-98-7]
EINECS number	231-847-6
RTECS number	GL8800000
Properties
Molecular formula	CuSO4·5H2O (pentahydrate) CuSO4 (anhydrous)
Molar mass	249.684 g/mol (pentahydrate) 159.608 g/mol (anhydrous)
Appearance	blue crystalline solid (pentahydrate) gray-white powder (anhydrous)
Melting point	110 °C (− 4H2O) 150 °C (423 K) (− 5H2O) 650 °C decomp.
Solubility in water	31.6 g/100 ml (0 °C)
Structure
Crystal structure	Triclinic
Coordination geometry	Octahedral
Thermochemistry
Standard molar entropy So298	109.05 J.K−1.mol−1
Hazards
EU classification	Harmful (Xn) Dangerous for the environment (N)
NFPA 704	0 2 0
Flash point	non flammable
Related compounds
Other cations	Nickel(II) sulfate Zinc sulfate
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

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