Magnesium sulfite

Crystal structure
General
Surname	Magnesium sulfite
Ratio formula	MgSO 3
Brief description	white solid (hexahydrate)
External identifiers / databases
EC number	231-825-6
ECHA InfoCard	100,028,932
PubChem	3014583
Wikidata	Q2396092
properties
Molar mass	104.37 g mol −1
Physical state	firmly
density	1.72 g cm −3 (hexahydrate)
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Magnesium sulfite is an inorganic chemical compound of magnesium from the group of sulfites .

Extraction and presentation

Magnesium sulfite can be obtained by reacting magnesium hydroxide with sulfur dioxide , with the hexahydrate being formed at temperatures below 40 ° C and the trihydrate above.

{\ displaystyle \ mathrm {Mg (OH) _ {2} + SO_ {2} +5 \ H_ {2} O \ longrightarrow MgSO_ {3} \ cdot 6H_ {2} O}}

It is also possible to display it by reacting sodium sulfite with magnesium chloride .

properties

Magnesium sulfite hexahydrate has a rhombohedral crystal structure with space group R 3 (space group no. 146) . The hexahydrate loses crystal water above 78 ° C and converts to the trihydrate. At 120 ° C for further reaction takes place dihydrate and at 395 ° C for anhydrate . The trihydrate has a tetragonal crystal structure with the space group P 4 ₁ 2 ₁ 2 (No. 92) , the dihydrate the monoclinic space group P 2 ₁ / c (No. 14) . Template: room group / 146Template: room group / 92Template: room group / 14

Formation during flue gas desulphurization

Magnesium sulphite is produced in systems for flue gas desulphurisation in which magnesium hydroxide is used as a washing alkali ( magnesium process ).

Individual evidence

^ ^A ^b ^c William M. Haynes: CRC Handbook of Chemistry and Physics, 93rd Edition . CRC Press, 2012, ISBN 1-4398-8049-2 , pp. 4–74 ( limited preview in Google Book Search).
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
↑ ^a ^b ^c Richard C. Ropp: Encyclopedia of the Alkaline Earth Compounds . Newnes, 2012, ISBN 0-444-59553-8 , pp. 143 ( limited preview in Google Book search).
^ Ulrich Förstner: Environmental protection technology . Springer DE, 2003, ISBN 3-540-44369-X , p. 150 ( limited preview in Google Book search).
^ Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . Taylor & Francis US, 2011, ISBN 1-4398-1461-9 , pp. 258 ( limited preview in Google Book search).

[William_M._Haynes-1] A ^b ^c William M. Haynes: CRC Handbook of Chemistry and Physics, 93rd Edition . CRC Press, 2012, ISBN 1-4398-8049-2 , pp. 4–74 ( limited preview in Google Book Search).

[NV-2] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[Richard_C._Ropp-3] Richard C. Ropp: Encyclopedia of the Alkaline Earth Compounds . Newnes, 2012, ISBN 0-444-59553-8 , pp. 143 ( limited preview in Google Book search).

[Ulrich_Förstner-4] Ulrich Förstner: Environmental protection technology . Springer DE, 2003, ISBN 3-540-44369-X , p. 150 ( limited preview in Google Book search).

[Dale_L._Perry-5] Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . Taylor & Francis US, 2011, ISBN 1-4398-1461-9 , pp. 258 ( limited preview in Google Book search).