Rubidium hydrogen sulfate

Structural formula
General
Surname	Rubidium hydrogen sulfate
Molecular formula	RbHSO 4
Brief description	colorless crystals
External identifiers / databases
CAS number 15587-72-1 EC number 239-649-1 ECHA InfoCard 100.036.029 Wikidata Q2171589
properties
Molar mass	182.54 g · mol -1
Physical state	firmly
density	2.89 g cm −3
Melting point	207 ° C
safety instructions
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 .

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.

${\displaystyle \mathrm {Rb_{2}S_{2}O_{7}+H_{2}O\longrightarrow 2\ RbHSO_{4}} }$

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 .

${\displaystyle \mathrm {H_{2}SO_{4}+\ RbCl\longrightarrow \ RbHSO_{4}+\ HCl} }$

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.

${\displaystyle \mathrm {2\ RbHSO_{4}\longrightarrow Rb_{2}S_{2}O_{7}+H_{2}O} }$

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

1. ^ ^{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).
2. ↑ 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 .
3. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
4. ↑ ^{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).
5. ↑ 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
6. ↑ ^{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). 
7. ↑ M. de Forcrand: "Sur les chlorures et sulfates de rubidium et de cesium" in Compt. Rend. Hebd. 1906 , 143 , p. 98 ( full text ).
8. ↑ R. Abegg, F. Auerbach: Handbuch der inorganic Chemie . Verlag S. Hirzel, Vol. 2, 1908. P. 432 ( full text ).