2001:980:46F0:1:E034:673D:13E0:715E at 21:23, 5 August 2014

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{{Chembox
| Name = Rubidium hydrogen sulfate
| ImageFile1 = Rubidiumion.svg
| ImageSize1 = 50px
| ImageCaption1 = rubidium ion
| Image2 = Hydrogen sulfate.svg
| ImageSize2 = 80px
| ImageCaption2 = hydrogen sulfate ion
| Section1 = {{Chembox Identifiers
| CAS-No = 15587-72-1}}
| Section2 = {{Chembox Properties
| Formula = RbHSO4
| MolarMass = 182,54 g/mol−1
| Appearance = Crystals with no colour<ref name='Lax'>Jean D'Ans, Ellen Lax: ''Taschenbuch für Chemiker und Physiker. 3. Elemente, anorganische Verbindungen und Materialien, Minerale, Band 3.'' 4. Auflage, Springer, 1997, ISBN 978-3-5406-0035-0, S. 692 ({{Google books|oWjEKDnsJgEC|Taschenbuch für Chemiker und Physiker|page=692}}).</ref>
| Density = 2.89 g·cm−3
| MeltingPt = 214 °C<ref name="Fehrmann">R. Fehrmann, S. Boghosian, H. Hamma-Cugny, J. Rogez: "Phase diagrams, structural and thermodynamic properties of molten salt solvents for the industrial SO2-oxidation catalyst" [http://downloads.gecamin.cl/cierre_eventos/molten2009/rsmns/00190_00854_rs.pdf Abstract]</ref>}}
| Section3 = {{Chembox Related
| OtherCations = [[rubidium oxide]] [[rubidium hydroxide]]
| OtherCpds = [[rubidium sulfate]]
}}}}
'''Rubidium hydrogen sulfate''' is the [[rubidium]] [[salt (chemistry)|salt]] of [[sulfuric acid]]. It has the formula RbHSO4.

==Synthesis==
It may be synthesised with water and a stoichiometric amount of [[rubidium disulfate]]. Reaction takes place where there is no humidity: <ref name="Rasmussen">S. B. Rasmussen, H. Hamma, K. M. 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. [http://www.saimm.co.za/Conferences/Slags2004/027_Rasmus.pdf Volltext] (PDF; 661 kB)</ref>

<math>\mathrm{Rb_2S_2O_7 + H_2O \longrightarrow 2\ RbHSO_4}</math>

There is an other method of creation. It is similar to the synthesis of [[sodium sulfate]] and [[potassium sulfate]]. For this reaction there need for [[rubidium chloride]] and a little bit warm sulfuric acid. Some [[hydrogen chloride]] is also produced during the reaction.

<math>\mathrm{ H_2SO_4 + \ RbCl \longrightarrow\ RbHSO_4 + \ HCl}</math>

==Properties==
It is a [[hydroscopic compound]]. It has a [[monocline crystal structure]], its structure is P21/n. Parameters of the bonding modes: a = 1440 pm, b = 462,2 pm, c = 1436 pm and β = 118,0°. Its crystals are [[isomorphs]] with [[ammonium hydrogen sulfate]] crystals. <ref name="Ashmore">J. P. Ashmore, H. E. Petch: "The Structure of RbHSO4 in its Paraelectric Phase" in ''Can. J. Phys'' '''1975''', ''53''(24), S. 2694-2702. {{doi|10.1139/p75-328}}</ref>

Its [[standard enthalpy]] is −1166 kJ/mol <ref name="Cowan">L. A. Cowan, R. M. Morcos, N. Hatada, A. Navrotsky, S. M. Haile: "High temperature properties of Rb3H(SO4)2 at ambient pressure: Absence of a polymorphic, superprotonic transition" in ''Solid State Ionics'' '''2008''', ''179'', S. 305-313. [http://addis.caltech.edu/publications/Rb3H(SO4)2%20absence%20of%20transition%202008.pdf Volltext] (PDF; 837 kB)</ref> During its dissolution in water there is 15.62 kJ/mol energy produced. <ref name="Forcrand">M. de Forcrand: "Sur les chlorures et sulfates de rubidium et de caesium" in ''Compt. Rend. Hebd.'' '''1906''', ''143'', S. 98. [http://gallica.bnf.fr/ark:/12148/bpt6k30977/f98.image.pagination Volltext]</ref>

After warming up it resolves to rubidium disulfate and water:<ref name="Abegg">R. Abegg, F. Auerbach: "Handbuch der anorganischen Chemie". Verlag S. Hirzel, Bd. 2, 1908. S. 432.[http://www.archive.org/stream/handbuchderanor09koppgoog#page/n451/mode/2up Volltext]</ref>

:<math>\mathrm{2\ RbHSO_4 \longrightarrow Rb_2S_2O_7 + H_2O}</math>

Like [[potassium]] and [[caesium]], rubidium has an other hydrogene sulfate compound as well: Rb3H(SO4)2.

==Sources==
{{reflist|2}}
[[Category:Rubidium compounds]]

Explicit algebraic stress model - Revision history

2001:980:46F0:1:E034:673D:13E0:715E at 21:23, 5 August 2014

188.202.103.177: lists