 | |
 | |
| Names | |
|---|---|
| IUPAC name Ammonium trioxovanadate(V) | |
| Other names Ammonium vanadate | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider |
|
| ECHA InfoCard | 100.029.329 |
| RTECS number |
|
| UNII | |
| UN number | 2859 |
| |
| |
| Properties | |
| NH4VO3 | |
| Molar mass | 116.98 g/mol |
| Appearance | white |
| Density | 2.326 g/cm3 |
| Melting point | >200 °C (392 °F; 473 K)[1] (decomposes) |
| 4.8 g/100 ml (20 °C)[1] | |
| Solubility | soluble indiethanolamine,ethanolamine |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards | possiblemutagen, dangerous for the environment |
| GHS labelling: | |
  | |
| Danger | |
| H301,H332,H340,H361,H370,H372,H412 | |
| P201,P202,P260,P261,P264,P270,P271,P273,P281,P301+P310,P304+P312,P304+P340,P307+P311,P308+P313,P312,P314,P321,P330,P405,P501 | |
| NFPA 704 (fire diamond) | |
| Flash point | Non-flammable |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose) | 58.1 mg/kg, oral (rat) |
| Related compounds | |
Otheranions | Ammonium orthovanadate Ammonium hexavanadate |
Othercations | Sodium metavanadate Potassium metavanadate |
Related compounds | Vanadium pentoxide |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Ammonium metavanadate is theinorganic compound with the formula NH4VO3. It is a white salt, although samples are often yellow owing to impurities of V2O5. It is an important intermediate in the purification of vanadium.[2]
The compound is prepared by the addition of ammonium salts to solutions of vanadate ions, generated by dissolution ofV2O5 in basic aqueous solutions, such as hot sodium carbonate. The compound precipitates as a colourless solid.[3][4] This precipitation step can be slow.
The compound adopts a polymeric structure consisting of chains of [VO3]−, formed as corner-sharing VO4 tetrahedra. These chains are interconnected viahydrogen bonds withammonium ions.[5]
 |  |  |
| ball-and-stick model | polyhedral model | [(VO3)n]n− chains |
Vanadium is often purified from aqueous extracts of slags and ore by selective precipitation of ammonium metavanadate. The material is then roasted to givevanadium pentoxide:[2]
Vanadates can behave as structural mimics of phosphates, and in this way they exhibit biological activity.[6][7]
Ammonium metavanadate is used to prepareMandelin reagent, a qualitative test foralkaloids.[citation needed]
