Potassium ferrioxalate
_trihydrate_in_vial.jpg) |
|
 |
|
| Names | |
|---|---|
|
IUPAC name
Potassium iron(III) oxalate
|
|
| Other names
potassium ferrioxalate
potassium trisoxalatoferrate(III) |
|
| Identifiers | |
| ECHA InfoCard | 100.035.398 |
| Properties | |
|
K 3[Fe(C 2O 4) 3] (anhydrous) K 3[Fe( C 2O 4)3]·3H 2O (trihydrate) |
|
| Molar mass | 437.20 g/mol (anhydrous) 491.25 g/mol (trihydrate) |
| Appearance | emerald green hydrated crystals |
| Density | 2.13 g/cm3 |
| Melting point | 230 °C (446 °F; 503 K) the trihydrate loses 3H2O at 113 °C |
| Structure | |
| octahedral | |
| 0 D | |
| Hazards | |
| Main hazards | Corrosive. Eye, respiratory and skin irritant. |
| R-phrases | R20, R21, R22, R34, R36/37/38 |
| Related compounds | |
|
Other anions
|
Sodium ferrioxalate |
|
Related compounds
|
Iron(II) oxalate Iron(III) oxalate |
|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|
|
 (what is   ?) |
|
| Infobox references | |
Potassium ferrioxalate, also known as potassium trisoxalatoferrate(III), is a chemical compound with the formula K
3[Fe(C
2O
4)
3], where iron is in the +3 oxidation state. It is an octahedral transition metal complex in which three bidentate oxalate ions are bound to an iron center. Potassium acts as a counterion, balancing the −3 charge of the complex. Crystals of the trihydrated form of the complex, K
3[Fe(C
2O
4)
3]·3H
2O, are emerald green in color. In solution, the salt dissociates to give the ferrioxalate anion, [Fe(C
2O
4)
3]3−, which appears fluorescent green in color. Potassium ferrioxalate is often used in chemical actinometry, i.e. the measure of light flux.
The complex can be synthesized by the reaction between iron(III) sulfate, barium oxalate and potassium oxalate:
...
Wikipedia