Zinc selenite

Structural formula
General
Surname	Zinc selenite
Molecular formula	ZnSeO 3
Brief description	white odorless solid
External identifiers / databases
EC number	237-048-9
ECHA InfoCard	100.033.666
PubChem	159686
Wikidata	Q9335141
properties
Molar mass	192.33 g mol −1
Physical state	firmly
density	4.75 g cm −3
Melting point	621 ° C
solubility	practically insoluble in water (16 mg l −1 at 20 ° C)
safety instructions
H and P phrases	H: 301-331-373-410
	P: 260-264-301 + 310-304 + 340-311-403 + 233
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Zinc selenite is an inorganic chemical compound of zinc from the selenite group .

Occurrence

Zinc selenite occurs naturally in the form of the mineral zincomenite .

Extraction and presentation

Zinc selenite can be obtained by reacting sodium selenite with zinc sulfate solutions or zinc (II) oxide with selenous acid solutions . It was first depicted by Berzelius in the early 19th century.

{\ displaystyle \ mathrm {Na_ {2} SeO_ {3} + ZnSO_ {4} \ longrightarrow ZnSeO_ {3} \ downarrow + \ Na_ {2} SO_ {4}}}

properties

Zinc selenite is a whitish solid that is practically insoluble in water. It occurs in two crystal structure forms, one of which is only metastable. There are also hydrates of the compound. The β-form has an orthorhombic crystal structure with the space group Pbca (space group no. 61) . The α-form arises from the dehydration of the mono- and dihydrates. Template: room group / 61

Individual evidence

↑ ^a ^b ^c ^d ^e ^f Entry on zinc selenite in the GESTIS substance database of the IFA , accessed on January 8, 2020(JavaScript required) .
↑ Hawthorne FC, TS Ercit, LA Groat: Structures of zinc selenite and copper selenite. In: Acta Crystallographica Section C Crystal Structure Communications. 42, p. 1285, doi : 10.1107 / S0108270186092545 .
^ William M. Haynes: CRC Handbook of Chemistry and Physics, 94th Edition . CRC Press, 2016, ISBN 978-1-4665-7115-0 , pp. 114 ( limited preview in Google Book search).
^ ^A ^b OECD: Chemical Thermodynamics of Selenium . Elsevier, 2005, ISBN 978-0-08-045751-2 , pp. 262 ( limited preview in Google Book search).
↑ ^a ^b Wolfgang Bensch, John Ralph Günter: The crystal structure of β-zinc selenite. In: Journal of Crystallography - Crystalline Materials. 174, 1986, doi : 10.1524 / zkri.1986.174.14.291 .
↑ L. Ya. Markovskii, Yu. P. Sapozhnikov: The different forms and some properties of neutral zinc selenite. In: Journal of Structural Chemistry. 1, 1960, p. 321, doi : 10.1007 / BF00748861 .

[GESTIS-1] ↑ ^a ^b ^c ^d ^e ^f Entry on zinc selenite in the GESTIS substance database of the IFA , accessed on January 8, 2020(JavaScript required) .

[DOI10.1107/S0108270186092545-2] Hawthorne FC, TS Ercit, LA Groat: Structures of zinc selenite and copper selenite. In: Acta Crystallographica Section C Crystal Structure Communications. 42, p. 1285, doi : 10.1107 / S0108270186092545 .

[William_M._Haynes-3] William M. Haynes: CRC Handbook of Chemistry and Physics, 94th Edition . CRC Press, 2016, ISBN 978-1-4665-7115-0 , pp. 114 ( limited preview in Google Book search).

[OECD-4] A ^b OECD: Chemical Thermodynamics of Selenium . Elsevier, 2005, ISBN 978-0-08-045751-2 , pp. 262 ( limited preview in Google Book search).

[DOI10.1524/zkri.1986.174.14.291-5] Wolfgang Bensch, John Ralph Günter: The crystal structure of β-zinc selenite. In: Journal of Crystallography - Crystalline Materials. 174, 1986, doi : 10.1524 / zkri.1986.174.14.291 .

[DOI10.1007/BF00748861-6] L. Ya. Markovskii, Yu. P. Sapozhnikov: The different forms and some properties of neutral zinc selenite. In: Journal of Structural Chemistry. 1, 1960, p. 321, doi : 10.1007 / BF00748861 .