Sodium metavanadate

Crystal structure
	__ Na + __ V 5+ __ O 2−
General
Surname	Sodium metavanadate
Ratio formula	NaVO 3
Brief description	white solid
External identifiers / databases
EC number	237-272-7
ECHA InfoCard	100,033,869
PubChem	4148882
Wikidata	Q418510
properties
Molar mass	121.93 g mol −1
Physical state	firmly
density	2.85 g cm −3
Melting point	630 ° C
solubility	soluble in water (210 g l −1 at 25 ° C)
safety instructions
H and P phrases	H: 301-332-319-361-372-411
	P: 260-280-304 + 340-314-305 + 351 + 338-273
Toxicological data	98 mg kg −1 ( LD 50 , rat , oral )
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Sodium metavanadate is a chemical compound of sodium with vanadium and oxygen from the group of vanadates .

Occurrence

Sodium metavanadate occurs naturally in the mineral metamunirite .

Extraction and presentation

Sodium metavanadate can be made by reacting sodium hydroxide with vanadium (V) oxide .

{\ displaystyle \ mathrm {2 \ NaOH + V_ {2} O_ {5} \ rightarrow 2 \ NaVO_ {3} + H_ {2} O}}

properties

Crystal structure of α-sodium metavanadate

Sodium metavanadate occurs in two different crystal structures (alpha and beta). The orthorhombic β-structure is more stable at room temperature , while the monoclinic α-phase is present at higher temperatures . In addition, a dihydrate is known; this crystallizes out of aqueous solution below 307.75 K, but quickly converts to β-sodium metavanadate in the air, releasing water of crystallization .

use

Sodium metavanadate is used as an intermediate product in the extraction of vanadium from corresponding ores and as a component of corrosion protection agents , as a catalyst and in the paint, glass and ceramic industries.

literature

Catherine E. Housecroft, AG Sharpe: Inorganic chemistry . 3. Edition. Pearson Education, 2007, ISBN 978-0-13-175553-6 ; P. 697 ( limited preview in Google Book search).

Individual evidence

↑ ^a ^b ^c Sodium Metavanadate Data Sheet (PDF) from Fisher Scientific , accessed February 13, 2014.

↑ ^a ^b data sheet from GfE Metalle und materials GmbH

↑ ^a ^b Entry on sodium metavanadate in the GESTIS substance database of the IFA , accessed on July 23, 2016(JavaScript required) .

↑ Sodium metavanadate data sheet from Sigma-Aldrich , accessed on April 14, 2011 ( PDF ).

↑ Report from the US Geological Survey (PDF; 275 kB)

↑ K. Kato and E. Takayama: The drainage behavior of sodium metavanadate dihydrate and the crystal structure of β-sodium metavanadate . In: Acta Cryst. , 1984, B40, pp. 102-105, doi : 10.1107 / S0108768184001828 .

↑ Report on vanadium at Wissenschaft Online

[fisher-1] Sodium Metavanadate Data Sheet (PDF) from Fisher Scientific , accessed February 13, 2014.

[gfe-2] ta sheet from GfE Metalle und materials GmbH

[GESTIS-3] Entry on sodium metavanadate in the GESTIS substance database of the IFA , accessed on July 23, 2016(JavaScript required) .

[Sigma-4] Sodium metavanadate data sheet from Sigma-Aldrich , accessed on April 14, 2011 ( PDF ).

[5] Report from the US Geological Survey (PDF; 275 kB)

[6] K. Kato and E. Takayama: The drainage behavior of sodium metavanadate dihydrate and the crystal structure of β-sodium metavanadate . In: Acta Cryst. , 1984, B40, pp. 102-105, doi : 10.1107 / S0108768184001828 .

[7] Report on vanadium at Wissenschaft Online