Cadmium selenate

Cadmium selenate
Identifiers

CAS Number	13814-62-5 anhydrous^Y 20861-74-9 monohydrate^Y 10060-09-0 dihydrate^Y
3D model (JSmol)	Interactive image
ChemSpider	146042
ECHA InfoCard	100.034.060
EC Number	237-481-3
PubChem CID	166912
UNII	3U4HEE3NCC
CompTox Dashboard (EPA)	DTXSID60884646
InChI InChI=1S/Cd.H2O4Se/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2 Key: VTFKXHQTGNWIJW-UHFFFAOYSA-L
SMILES [Cd+2].[O-][Se](=O)(=O)[O-]
Properties
Chemical formula	CdO₄Se
Molar mass	255.381 g·mol⁻¹
Appearance	colourless solid (dihydrate)^[1]
Density	3.62 g·cm⁻³ (dihydrate)^[2]
Melting point	100 °C (dihydrate decomposes)^[2]
Solubility in water	70.5 g·l⁻¹ ^[2]
Hazards
GHS labelling:^[3]
Pictograms
Signal word	Warning
Hazard statements	H301, H331, H373, H410
Precautionary statements	P260, P261, P264, P270, P271, P273, P301+P316, P304+P340, P316, P319, P321, P330, P391, P403+P233, P405, P501
Related compounds
Other anions	cadmium sulfate cadmium selenite
Other cations	zinc selenate mercury selenate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Chemical compound

Cadmium selenate is a selenate of cadmium, with the chemical formula CdSeO₄.

Preparation

Cadmium selenate can be formed by the reaction of cadmium oxide and selenic acid. The product is a mixture of monohydrate and dihydrate.^[4]

CdO + H₂SeO₄ → CdSeO₄ + H₂O

Properties

Cadmium selenate dihydrate is a colorless solid. At 100 °C, the dihydrate releases water of crystallization to form cadmium selenate monohydrate.^[1] The monohydrate is monoclinic with space group P2₁/c (no. 14),^[4] while the dihydrate is orthorhombic, with space group Pbca (no. 61).^[5]

References

^ ^a ^b R. J. Meyer (2013), Cadmium System-Nummer 33, Springer-Verlag, p. 133, ISBN 978-3-662-11295-3
^ ^a ^b ^c William M. Haynes (2016), CRC Handbook of Chemistry and Physics, 94th Edition, CRC Press, p. 54, ISBN 978-1-4665-7115-0
^ "Cadmium selenate". pubchem.ncbi.nlm.nih.gov.
^ ^a ^b Stålhandske, C. (1981-11-15). "Structure of cadmium selenate monohydrate". Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 37 (11): 2055–2057. Bibcode:1981AcCrB..37.2055S. doi:10.1107/S0567740881007942.
^ H.U.v. Vogel (2013), Chemiker-Kalender, Springer-Verlag, p. 78, ISBN 978-3-662-06237-1