Potassium molybdate

Crystal structure
	__ K + __ Mon 6+ __ O 2−
Crystal system	monoclinic
Space group	C 2 / m (No. 12)
Lattice parameters	a = 12.348 Å; b = 6.081 Å; c = 7.538 Å; β = 115.74 °;
General
Surname	Potassium molybdate
other names	Dipotassium molybdate
Ratio formula	K 2 MoO 4
Brief description	colorless solid
External identifiers / databases
EC number	236-599-2
ECHA InfoCard	100.033.258
PubChem	6093816
ChemSpider	3434921
Wikidata	Q4300385
properties
Molar mass	238.13 g mol −1
Physical state	firmly
density	2.34 g cm −3
Melting point	919 ° C
solubility	soluble in water (646 g l −1 at 25 ° C)
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
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Potassium molybdate is an inorganic chemical compound of potassium from the group of molybdates .

Extraction and presentation

Potassium molybdate can be obtained by reacting an aqueous solution of potassium hydroxide with ammonium heptamolybdate .

properties

Potassium molybdate is a colorless solid. It has a monoclinic crystal structure with the space group C 2 / m (space group no. 12) isomorphic to potassium tungstate . At higher temperatures or pressures, a phase change to another structure takes place. Template: room group / 12

use

Potassium molybdate is used in chemical research and studied as a dietary supplement.

Individual evidence

↑ ^a ^b B. M. Gatehouse, P. Leverett: Crystal structure of potassium molybdate, K2MoO4. In: Journal of the Chemical Society A: Inorganic, Physical, Theoretical. 1969, p. 849, doi : 10.1039 / J19690000849 .
↑ ^a ^b ^c ^d ^e data sheet Potassium molybdate, 98% from Sigma-Aldrich , accessed on June 12, 2019 ( PDF ).
↑ ^a ^b ^c Dale L. Perry: Handbook of Inorganic Compounds . CRC Press, 2016, ISBN 978-1-4398-1462-8 , pp. 328 ( limited preview in Google Book search).
↑ ^a ^b Michio Inagaki, Yasuo Nishikawa, Motosugu Sakai: Synthesis and phase transitions of K2MoO4. In: Journal of Materials Chemistry. 2, 1992, p. 323, doi : 10.1039 / JM9920200323 .
↑ FXNM Kools, AS Koster, GD Rieck: The Structures of Potassium, Rubidium and Cesium Molybdate and Tungstate . In: Acta Cryst. B26, 1970, p. 19741-1977 , doi : 10.1107 / S0567740870005277 .
^ AJ van den Berg, H. Overeijnder, F. Tuinstra: The average structure of K2MoO4 in the incommensurate phase at 633 K. In: Acta Crystallographica Section C Crystal Structure Communications. 39, p. 678, doi : 10.1107 / S0108270183005909 .
↑ W. Paraguassu, GD Saraiva, S. Guerini, PTC Freire, BTO Abagaro, J. Mendes Filho: Pressure-induced phase transition on K2MoO4: A Raman scattering study and ab initio calculations. In: Journal of Solid State Chemistry. 196, 2012, p. 197, doi : 10.1016 / j.jssc.2012.06.021 .
↑ Data sheet Potassium molybdenum oxide, anhydrous, 99.8% (metals basis) from AlfaAesar, accessed on June 12, 2019 ( PDF )(JavaScript required) .

[DOI10.1039/J19690000849-1] B. M. Gatehouse, P. Leverett: Crystal structure of potassium molybdate, K2MoO4. In: Journal of the Chemical Society A: Inorganic, Physical, Theoretical. 1969, p. 849, doi : 10.1039 / J19690000849 .

[Sigma-2] ↑ ^a ^b ^c ^d ^e data sheet Potassium molybdate, 98% from Sigma-Aldrich , accessed on June 12, 2019 ( PDF ).

[Dale_L._Perry-3] Dale L. Perry: Handbook of Inorganic Compounds . CRC Press, 2016, ISBN 978-1-4398-1462-8 , pp. 328 ( limited preview in Google Book search).

[DOI10.1039/JM9920200323-4] Michio Inagaki, Yasuo Nishikawa, Motosugu Sakai: Synthesis and phase transitions of K2MoO4. In: Journal of Materials Chemistry. 2, 1992, p. 323, doi : 10.1039 / JM9920200323 .

[ActaCryst-5] FXNM Kools, AS Koster, GD Rieck: The Structures of Potassium, Rubidium and Cesium Molybdate and Tungstate . In: Acta Cryst. B26, 1970, p. 19741-1977 , doi : 10.1107 / S0567740870005277 .

[DOI10.1107/S0108270183005909-6] AJ van den Berg, H. Overeijnder, F. Tuinstra: The average structure of K2MoO4 in the incommensurate phase at 633 K. In: Acta Crystallographica Section C Crystal Structure Communications. 39, p. 678, doi : 10.1107 / S0108270183005909 .

[DOI10.1016/j.jssc.2012.06.021-7] W. Paraguassu, GD Saraiva, S. Guerini, PTC Freire, BTO Abagaro, J. Mendes Filho: Pressure-induced phase transition on K2MoO4: A Raman scattering study and ab initio calculations. In: Journal of Solid State Chemistry. 196, 2012, p. 197, doi : 10.1016 / j.jssc.2012.06.021 .

[Alfa-8] Data sheet Potassium molybdenum oxide, anhydrous, 99.8% (metals basis) from AlfaAesar, accessed on June 12, 2019 ( PDF )(JavaScript required) .