Iron (II) disulfide
Crystal structure | |||||||||||||||||||
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__ Fe 2+ __ __ S 2 2− | |||||||||||||||||||
General | |||||||||||||||||||
Surname | Iron (II) disulfide | ||||||||||||||||||
other names |
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Ratio formula | FeS 2 | ||||||||||||||||||
Brief description |
brass yellow to golden yellow crystals (pyrite) |
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External identifiers / databases | |||||||||||||||||||
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properties | |||||||||||||||||||
Molar mass | 119.98 g · mol -1 | ||||||||||||||||||
Physical state |
firmly |
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density |
5.0 to 5.2 g cm −3 (pyrite) |
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solubility |
practically insoluble in water; insoluble in dilute acids; soluble in concentrated hydrochloric acid, HNO 3 |
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safety instructions | |||||||||||||||||||
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Iron (II) disulfide is the disulfide of divalent iron with the formula FeS 2 .
Occurrence
Of course, iron (II) disulfide occurs in mineral form as pyrite or marcasite .
Extraction and presentation
Iron (II) disulfide can be produced by heating iron (II) sulfide with sulfur :
Iron (II) disulphide is also formed when hydrogen sulphide H 2 S is passed over iron (III) oxide in red heat:
properties
Pure iron (II) disulfide forms gold or brass yellow crystals . In the cubic crystal form, iron (II) disulfide occurs naturally as pyrite . If pyrite is heated, this sulfur splits off and burns to sulfur dioxide SO 2 and iron (III) oxide Fe 2 O 3 :
Like iron (II) sulfide , it reacts with acids to form hydrogen sulfide (the disulfane (H 2 S 2 ) initially formed in this case is unstable under normal conditions and breaks down to H 2 S and sulfur).
use
Iron (II) disulfide was previously used in large quantities for the production of sulfuric acid H 2 SO 4 . Nowadays it is used for the cathode of the lithium iron sulfide battery .
Individual evidence
- ↑ Entry on pyrite. In: Römpp Online . Georg Thieme Verlag, accessed on June 19, 2014.
- ↑ Entry on marcasite. In: Römpp Online . Georg Thieme Verlag, accessed on June 19, 2014.
- ↑ a b D'Ans-Lax, pocket book for chemists and physicists , Volume 3 (1998); ISBN 3-540-60035-3
- ↑ a b c Entry on iron disulfide in the GESTIS material database of the IFA , accessed on December 22, 2019 (JavaScript required)
- ↑ Chemists Calendar; Synowietz, shepherd; Berlin, Heidelberg, 1984, pages 104-105
- ^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1657.
- ↑ Page no longer available , search in web archives: p. 7 (excerpt from: Inorganische Chemie, p. 287, Pearson, 2010) ( Page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
- ↑ JCF van der Meer: Technical course starter batteries . Vieweg & Sohn, Braunschweig / Wiesbaden 1992, ISBN 978-3-322-86800-8 , p. 49 ( limited preview in Google Book search).