Cadmium sulfate
IUPAC name	Cadmium(II) sulfate
Other names	Sulfuric acid, cadmium salt (1:1), Niedermayrite
Identifiers
CAS number	10124-36-4 Y, 7709-84-3 (monohydrate) 15244-35-9 (octahydrate)
EC number	233-331-6
UN number	2570
RTECS number	EV2700000
Properties
Molecular formula	CdSO4 CdSO4·H2O (monohydrate) 3CdSO4·8H2O (octahydrate)
Molar mass	208.47 g/mol (anhydrous) 226.490 g/mol (monohydrate) 769.546 g/mol (octahydrate)
Appearance	White hygroscopic solid
Density	4.691 g/cm3 (anhydrous) 3.79 g/cm3 (monohydrate) 3.08 g/cm3 (octahydrate) [1]
Melting point	1000 °C (anhydrous) 105 °C (monohydrate) 40 °C (octahydrate)
Boiling point	(decomposes to basic sulfate and then oxide)
Solubility in water	anhydrous: 75 g/100 mL (0 °C) 76.4 g/100 mL (25 °C) 58.4 g/100 mL (99 °C) octahydrate: very soluble
Solubility	insoluble in ethanol
Structure
Crystal structure	orthorhombic (anhydrous) monoclinic (octahydrate)
Hazards
MSDS	[1]
EU Index	048-009-00-9
EU classification	Carc. Cat. 2 Muta. Cat. 2 Repr. Cat. 2 Very toxic (T+) Dangerous for the environment (N)
R-phrases	R45, R46, R60, R61, R25, R26, R48/23/25, R50/53
S-phrases	S53, S45, S60, S61
Related compounds
Other anions	Cadmium acetate, Cadmium chloride, Cadmium nitrate
Other cations	Zinc sulfate, Calcium sulfate, Magnesium sulfate
Y (what is this?)  (verify) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Cadmium sulfate is used widely in industries for the electroplating of cadmium in electronic circuits. It is also known as the hydrated form, CdSO₄.⁸/₃H₂O. Cadmium sulfate is very rarely found naturally in from of tetrahydrate mineral called drobecite and as basic salt in the mineral Niedermayrite. It is used as a pigment.

[edit] Preparation

Cadmium sulfate is prepared by the reaction of cadmium metal or its oxide or hydroxide with dilute sulfuric acid:

CdO + H₂SO₄ → CdSO₄ + H₂O

[edit] Octahydrate

The octahydrate of cadmium sulfate, 3CdSO₄·8H₂O, is a colorless, odorless monoclinic crystal. It is made by the reaction of sulfuric acid with metal cadmium or with cadmium oxide. Its uses are as a pigment or as an electrolyte in a Weston standard cell.

[edit] References

1. ^ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0070494398

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