Potassium perrhenate

Crystal structure
__ K +      __ Re 7+      __ O 2−
General
Surname	Potassium perrhenate
Ratio formula	KReO 4
Brief description	white solid
External identifiers / databases
CAS number 10466-65-6 EC number 233-953-8 ECHA InfoCard 100.030.854 PubChem 3661560 Wikidata Q15632835
properties
Molar mass	289.30 g mol −1
Physical state	firmly
density	5.39 g cm −3 (25 ° C)
Melting point	555 ° C
boiling point	1370 ° C
solubility	poorly soluble in water (11.9 g l −1 at 25 ° C)
Refractive index	1.643 (20 ° C)
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 272-315-319-335 P: 220-261-305 + 351 + 338
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C

Potassium perrhenate is a chemical compound from the group of perrhenates , the salts of perrhenic acid .

Extraction and presentation

Potassium perrhenate can be obtained by reacting potassium hydroxide with perrhenic acid.

${\displaystyle \mathrm {KOH+HReO_{4}\longrightarrow KReO_{4}+H_{2}O} }$

properties

Potassium perrhenate is a white solid that is poorly soluble in water and ethanol . It has a tetragonal crystal structure of the Scheelite type with the space group I 4 ₁ / a (space group no. 88) and the lattice parameters a = 567.4 pm and c = 1266.8 pm. It is a powerful oxidizer.

Individual evidence

1. ↑ ^{a b c d e} data sheet Potassium perrhenate, 99.98% trace metals basis from Sigma-Aldrich , accessed on August 5, 2013 ( PDF ).
2. ↑ ^{a b c d} Georg Brauer (Ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1633.
3. ↑ Hans Hölemann, Walter Klesse: Contributions to Chemistry and Electrochemistry of rhenium VI. The solubility of potassium perrhenate in water between 10 and 518 °. In: Journal of Inorganic and General Chemistry. 237, 1938, p. 172, doi : 10.1002 / zaac.19382370207 .
4. ↑ ^{a b} Data sheet Potassium perrhenate, 99% (metals basis), Re 64% from AlfaAesar, accessed on August 5, 2013 ( PDF )(JavaScript required) .