Potassium metavanadate

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Crystal structure
Crystal structure of potassium metavanadate
__ K + __ O 2− __ V 5+
General
Surname Potassium metavanadate
other names
  • Potassium vanadate
  • Potassium vanadium trioxide
Ratio formula KVO 3
Brief description

odorless, colorless crystalline powder

External identifiers / databases
CAS number 13769-43-2
EC number 237-388-8
ECHA InfoCard 100,033,975
PubChem 4571336
Wikidata Q15627936
properties
Molar mass 138.03 g mol −1
Physical state

firmly

density

2.84 g cm −3 (25 ° C)

Melting point

520 ° C

solubility

124 g / l at 20 ° C (water)

safety instructions
GHS labeling of hazardous substances
07 - Warning 08 - Dangerous to health 09 - Dangerous for the environment

danger

H and P phrases H: 302-319-332-361-372-411
P: 260-273-280-304 + 340-305 + 351 + 338-314
Toxicological data
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Potassium metavanadate , KVO 3 is a chemical compound of potassium and the VO 3 - ion.

Extraction and presentation

Potassium metavanadate can be obtained by reacting potassium chloride with vanadium (V) oxide .

properties

Potassium metavanadate is an odorless, colorless crystalline powder. It has a density of 2.84 g · cm −3 and melts at 520 ° C.

Its monohydrate has an orthorhombic crystal structure with the space group Pnam (space group no. 62, position 6) . The anhydrate has a crystal structure with the space group Pbcm (space group no. 57) . Here the VO 4 tetrahedron corners are linked to form infinite chains. Template: room group / 62.6 Template: room group / 57

use

Potassium metavanadate is used as a corrosion inhibitor and anti-scaling agent. It is also often used in the chemical fertilizer industry, glass and ceramic industry, pharmaceutical industry, in the production of pigments for plastics, paints, ceramics. It is also used for the desulphurisation of industrial gases and for the adsorption and elimination of H 2 S.

safety instructions

Ingestion or inhalation of the compound is harmful. It causes severe irritation to the eyes. Organs can be damaged through prolonged or repeated exposure. It is suspected that potassium metavanadate can decrease fertility in women and harm the unborn child.

In the event of a fire, potassium oxide and vanadium oxides can be formed. The substance reacts violently with acids , strong oxidizing agents and strong bases .

Individual evidence

  1. ↑ a b c d e f g h Entry on potassium metavanadate in the GESTIS substance database of the IFA , accessed on February 8, 2019 (JavaScript required)
  2. ↑ a b c d e data sheet potassium metavanadate from AlfaAesar, accessed on February 8, 2019 ( PDF )(JavaScript required) .
  3. ↑ Trypuć, Mieczysław & Torski, Zbigniew & Kiełkowska, Urszula. (2001). Experimental Determination of the Optimum Conditions of KVO 3 Synthesis Based on KCl and V 2 O 5 in the Presence of Steam. Industrial & Engineering Chemistry Research - IND ENG CHEM RES. 40.1022-1025. doi : 10.1021 / ie000588i .
  4. ↑ CL Christ, JR Clark, HT Evans: The crystal structure of potassium metavanadate monohydrate, KVO3.H2O. In: Acta Crystallographica. 7, 1954, p. 801, doi : 10.1107 / S0365110X54002496 .
  5. ^ NK Misra, RNP Choudhary, KL Yadav: Structural, spectroscopic and dielectric properties of KVO 3 . In: Pramana. 44, 1995, p. 219, doi : 10.1007 / BF02848473 .
  6. ↑ Subgroup elements, lanthanoids, actinides, transactinides . Walter de Gruyter GmbH & Co KG, 2016, ISBN 978-3-11-049590-4 , p. 1824 ( limited preview in Google Book search).
  7. ↑ Data sheet Potassium metavanadate from Sigma-Aldrich , accessed on February 8, 2019 ( PDF ).