Rubidium hydrogen sulfate
Structural formula | |||||||||||||
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General | |||||||||||||
Surname | Rubidium hydrogen sulfate | ||||||||||||
Molecular formula | RbHSO 4 | ||||||||||||
Brief description |
colorless crystals |
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External identifiers / databases | |||||||||||||
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properties | |||||||||||||
Molar mass | 182.54 g · mol -1 | ||||||||||||
Physical state |
firmly |
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density |
2.89 g cm −3 |
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Melting point |
207 ° 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 . |
Rubidium hydrogen sulfate is a rubidium salt of sulfuric acid .
Manufacturing
Rubidium hydrogen sulfate can be prepared by reaction of stoichiometric quantities of Rubidiumdisulfat be prepared and water.
Analogous to the synthesis of potassium and sodium hydrogen sulfate , rubidium hydrogen sulfate can be produced from rubidium chloride and moderately warm, concentrated sulfuric acid. Hydrogen chloride is produced as a by-product .
properties
Physical Properties
Rubidium hydrogen sulfate is hygroscopic . It crystallizes in the monoclinic crystal system in the space group P 2 1 / n (space group no. 14, position 2) with the lattice parameters a = 1440 pm, b = 462.2 pm, c = 1436 pm and β = 118.0 °. The crystals are isomorphic to the crystals of ammonium hydrogen sulfate .
The standard enthalpy of formation of rubidium hydrogen sulfate is −1166 kJ / mol. The heat of solution is −15.62 kJ / mol.
Chemical properties
During annealing, rubidium hydrogen sulfate changes into rubidium disulfate with elimination of water.
Analogous to potassium and cesium, there is also a higher hydrogen sulfate of rubidium with the formula Rb 3 H (SO 4 ) 2 .
Individual evidence
- ^ A b c Jean D'Ans, Ellen Lax: Pocket book for chemists and physicists. 3. Elements, inorganic compounds and materials, minerals, Volume 3. 4. Edition, Springer, 1997, ISBN 978-3-5406-0035-0 , p. 692 ( limited preview in Google book search).
- ↑ N. Toupry, H. Poulet, M. Le Postellec (1981): Raman study of the phase transition in RbHSO 4 . In: Journal of Raman Spectroscopy, 11, 81-91. doi : 10.1002 / jrs.1250110207 .
- ↑ 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 S. B. Rasmussen, H. Hamma, KM Eriksen, G. Hatem, M. Gaune-Escard, R. Fehrmann: Physico-chemical properties and transition metal complex formation in alkali pyrosulfate and hydrogen sulfate melts . VII International Conference on Molten Slags Fluxes and Salts, The South African Institute of Mining and Metallurgy, 2004 ( PDF ; 661 kB).
- ↑ JP Ashmore, HE Petch: The Structure of RbHSO 4 in its Paraelectric Phase. In: Can. J. Phys 1975 , 53 (24), pp. 2694-2702. doi : 10.1139 / p75-328
- ↑ a b L.A. Cowan, RM Morcos, N. Hatada, A. Navrotsky, SM Haile: High temperature properties of Rb 3 H (SO 4 ) 2 at ambient pressure: Absence of a polymorphic, superprotonic transition. In: Solid State Ionics 2008 , 179 , pp. 305-313 ( PDF ( Memento of the original from June 22, 2010 in the Internet Archive ) Info: The archive link has been inserted automatically and has not yet been checked. Please check the original and archive link according to instructions and then remove this note .; 837 kB).
- ↑ M. de Forcrand: "Sur les chlorures et sulfates de rubidium et de cesium" in Compt. Rend. Hebd. 1906 , 143 , p. 98 ( full text ).
- ↑ R. Abegg, F. Auerbach: Handbuch der inorganic Chemie . Verlag S. Hirzel, Vol. 2, 1908. P. 432 ( full text ).