Rubidium sulfate
Crystal structure | ||||||||||||||||
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__ Rb + __ S 6+ __ O 2− | ||||||||||||||||
Crystal system |
orthorhombic |
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Space group |
Pnma (No. 62) |
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Lattice parameters |
a = 780.1 pm, b = 596.5 pm, c = 1041.6 pm |
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General | ||||||||||||||||
Surname | Rubidium sulfate | |||||||||||||||
Ratio formula | Rb 2 SO 4 | |||||||||||||||
Brief description |
white odorless crystals |
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External identifiers / databases | ||||||||||||||||
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properties | ||||||||||||||||
Molar mass | 266.9 g · mol -1 | |||||||||||||||
Physical state |
firmly |
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density |
3.613 g cm −3 |
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Melting point |
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boiling point |
1700 ° C |
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solubility |
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safety instructions | ||||||||||||||||
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Toxicological data | ||||||||||||||||
Thermodynamic properties | ||||||||||||||||
ΔH f 0 |
−1443 kJ / mol |
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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 sulfate is the rubidium salt of sulfuric acid .
Manufacturing
Rubidium sulfate can be produced from rubidium hydroxide and sulfuric acid by the salt formation reaction .
Synthesis is also possible from rubidium carbonate .
properties
Physical Properties
Rubidium sulfate crystallizes in the orthorhombic crystal system in the space group Pnma (space group no. 62) with the lattice parameters a = 780.1 pm, b = 596.5 pm, c = 1041.6 pm, and 4 formula units per unit cell . The crystals are isomorphic with the crystals of potassium sulfate . At 657 ° C it transforms into another modification. The water solubility of the substance increases with increasing temperature, so at 0 ° C 364 g and at 100 ° C 826 g of rubidum sulfate dissolve in 1 l of water.
The standard enthalpy of formation of rubidium sulfate is −1443 kJ / mol, the heat of solution is 27.88 kJ / mol.
Chemical properties
By means of electrolytic oxidation, a saturated solution of rubidium sulfate and sulfuric acid is formed at low temperature into rubidium persulfate Rb 2 S 2 O 8 .
Individual evidence
- ↑ a b c d data sheet rubidium sulfate from AlfaAesar, accessed on June 24, 2010 ( PDF )(JavaScript required) .
- ↑ a b c d Jean D'Ans, Ellen Lax: Pocket book for chemists and physicists. 3. Elements, inorganic compounds and materials, minerals . 4th edition. tape 3 . Springer, 1997, ISBN 978-3-540-60035-0 , pp. 692 ( limited preview in Google Book search).
- ↑ Rubidium sulfate data sheet from Acros, accessed on June 24, 2010.
- ↑ Data sheet Rubidium sulfate from Sigma-Aldrich , accessed on May 9, 2017 ( PDF ).
- ↑ a b data sheet Rubidium sulfate (PDF) from Strem, accessed on December 25, 2012.
- ↑ a b M. de Forcrand: Sur les chlorures et sulfates de rubidium et de caesium . In: Compt. Rend. Hebd. tape 143 , 1906, pp. 98 ( full text ).
- ↑ a b c d R. Abegg, F. Auerbach: Handbuch der inorganic Chemie . tape 2 . S. Hirzel, 1908, p. 431 ( full text ).