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Copper(II) sulfate, anhydrous
(cupric sulfate, copper sulphate, cupric sulphate)
CAS no: 7758-98-7 Formula: CuSO4 Molecular weight: 159.61
Physical Data
Appearance: Greenish white amorphous powder or rhombohedral crystalline solids
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Melting point: 560°C (decomposes)
Boiling point: -
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Density: 3.60 g/cm3
Solubility: 22.0 g/100 g H2O
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Thermodynamic Data
Enthalpy of formation: -771.4 kJ/mol
Gibbs energy of formation: -662.2 kJ/mol
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Entropy: 109.2 J/mol K
Heat capacity: -
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Production and preparation
Occurs in nature as the mineral hydrocyanite. It is prepared by treating copper(II) oxide or copper metal with warm
sulfuric acid to give the blue pentahydrate salt. The anhydrous salt is produced by heating the hydrated salt to 150°C.
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Behavior and Chemical Properties
The anhydrous copper sulfate is readily dissolved in water but it is insoluble in alcohol. Decomposes at 560°C to give copper(II) oxide (CuO).
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History and Uses
It is hygroscopic and used to detect the presence of water by taking up the waters of hydration to give blue pentahydrate salt. It is also used as a desiccating agent to
dry certain organic liquids such as alcohols.
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Hazard, Storage and Handling
Anhydrous copper sulfate readily absorbs moisture in air. It should be stored in air-tight container. For hazard and safety aspects see
copper(II) sulfate pentahydrate.
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(Last update: November 2002) |
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