Tellurium hydrogen
Structural formula | ||||||||||||||||
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General | ||||||||||||||||
Surname | Tellurium hydrogen | |||||||||||||||
other names |
Monotellan |
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Molecular formula | H 2 Te | |||||||||||||||
Brief description |
colorless gas with a pungent odor |
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External identifiers / databases | ||||||||||||||||
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properties | ||||||||||||||||
Molar mass | 129.62 g mol −1 | |||||||||||||||
Physical state |
gaseous |
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density |
5.76 kg m −3 (0 ° C) |
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Melting point |
−49 ° C |
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boiling point |
−1.25 ° C |
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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 . |
Tellurium hydrogen , also known as monotellan , is a chemical compound of tellurium and hydrogen and is a very toxic, easily condensable gas .
Extraction and presentation
It is produced by electrolytic reduction of tellurium at the cathode in 50% sulfuric acid or by protolysis of salt-like tellurides in acids , such as the reaction of aluminum telluride with hydrochloric acid :
properties
Tellurium hydrogen has an unpleasant garlic-like odor like arsine . The gas is easily soluble in water, decomposes in the air and burns with a bluish flame to tellurium dioxide and water . Hydro telluric acid , which is moderately strong and unstable due to oxidation, is formed in water . The dissociation constants pKa 1 and pKa 2 are 2.64 and 8.80, respectively.
Tellurium hydrogen is angled (bond angle 89.5 °), the bond length Te – H is 169 pm in each case .
Web links
- Entry on tellurium hydrogen . In: P. J. Linstrom, W. G. Mallard (Eds.): NIST Chemistry WebBook, NIST Standard Reference Database Number 69 . National Institute of Standards and Technology , Gaithersburg MD
Individual evidence
- ↑ a b c d e f Entry on tellurium hydrogen in the GESTIS substance database of the IFA , accessed on January 9, 2019(JavaScript required) .
- ↑ G. Brauer (Ed.): Handbook of Preparative Inorganic Chemistry , 2nd ed., Vol. 1, Academic Press 1963, pp. 439-441.
- ↑ Wolfgang Legrum: Fragrances, between stink and fragrance , Vieweg + Teubner Verlag (2011) p. 74, ISBN 978-3-8348-1245-2 .
- ^ D'Ans-Lax, paperback for chemists and physicists, 4th edition, volume 3, Springer Verlag 1998, ISBN 3-540-60035-3 .
- ^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 627.