Rubidium sulfate

Crystal structure
	__ Rb + __ S 6+ __ O 2−
Crystal system	orthorhombic
Space group	Pnma (No. 62)
Lattice parameters	a = 780.1 pm, b = 596.5 pm, c = 1041.6 pm
General
Surname	Rubidium sulfate
Ratio formula	Rb 2 SO 4
Brief description	white odorless crystals
External identifiers / databases
EC number	231-301-7
ECHA InfoCard	100.028.456
PubChem	197088
Wikidata	Q426424
properties
Molar mass	266.9 g · mol -1
Physical state	firmly
density	3.613 g cm −3
Melting point	1050 ° C ; 1060 ° C;
boiling point	1700 ° C
solubility	easily in water (424 g l −1 at 10 ° C); insoluble in acetone;
safety instructions
GHS labeling of hazardous substances	no GHS pictograms
	no GHS pictograms
H and P phrases	H: no H-phrases
	P: no P-phrases
Toxicological data	4594 mg kg −1 ( LD 50 , rat , oral ) ; 1000 mg kg −1 ( LD 50 , rat , ip ) ;
Thermodynamic properties
ΔH f 0	−1443 kJ / mol
	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 .

{\ displaystyle {\ ce {2RbOH + H2SO4 -> Rb2SO4 + 2H2O}}}

Synthesis is also possible from rubidium carbonate .

{\ displaystyle {\ ce {Rb2CO3 + H2SO4 -> Rb2SO4 + H2O + CO2 ^}}}

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. Template: room group / 62

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 ).

[Alfa-1] ta sheet rubidium sulfate from AlfaAesar, accessed on June 24, 2010 ( PDF )(JavaScript required) .

[Lax-2] 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).

[Acros-3] Rubidium sulfate data sheet from Acros, accessed on June 24, 2010.

[Sigma-4] Data sheet Rubidium sulfate from Sigma-Aldrich , accessed on May 9, 2017 ( PDF ).

[Strem-5] ta sheet Rubidium sulfate (PDF) from Strem, accessed on December 25, 2012.

[Forcrand-6] M. de Forcrand: Sur les chlorures et sulfates de rubidium et de caesium . In: Compt. Rend. Hebd. tape 143 , 1906, pp. 98 ( full text ).

[Abegg-7] R. Abegg, F. Auerbach: Handbuch der inorganic Chemie . tape 2 . S. Hirzel, 1908, p. 431 ( full text ).