Potassium trioxalatoferrate (III) - inorganic compound,
| Trioxalatoferrate | |
|---|---|
 | |
| Are common | |
| Systematic name | Potassium trioxalatoferrate (III) |
| Traditional names | Potassium trioxalatoferriate; iron (III) oxalate-potassium |
| Chem. formula | K 3 [Fe (C 2 O 4 ) 3 ] |
| Physical properties | |
| condition | hydrate - green crystals |
| Molar mass | 437.20 g / mol |
| Density | trihydrate - 2.133 g / cm³ |
| Thermal properties | |
| T. melt. | trihydrate - 100 ° C |
| T. decomp. | trihydrate - 230 ° C |
| Chemical properties | |
| Solubility in water | 4.7 0 g / 100 ml |
| Solubility in | 105 100 g / 100 ml |
| Classification | |
| Reg. CAS number | 15375-82-3 |
| PubChem | |
| Reg. EINECS number | |
| Smiles | |
| Inchi | |
| ChemSpider | |
complex salt of iron , potassium and oxalic acid with the formula K 3 [Fe (C 2 O 4 ) 3 ], dissolves in water, forms crystalline hydrates - green crystals.
Getting
- The reaction of iron (III) chloride and potassium oxalate :
![{\displaystyle {\mathsf {FeCl_{3}+3K_{2}C_{2}O_{4}\ {\xrightarrow {}}\ K_{3}[Fe(C_{2}O_{4}){}_{3}]+3KCl}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/e01eb2be2345cdb579cbc91f9bb190d71df9842d)
Physical Properties
Potassium trioxalatoferrate (III) forms a crystalline hydrate of the composition K 3 [Fe (C 2 O 4 ) 3 ] • 3H 2 O - green crystals of monoclinic syngony , space group P 2 1 / c , cell parameters a = 0.7762 nm, b = 1 , 9937 nm, c = 1.0353 nm, β = 107.75 °, Z = 4.
It is soluble in water, not soluble in ethanol .
Chemical Properties
- Decomposes on exposure to light:
![{\displaystyle {\mathsf {2K_{3}[Fe(C_{2}O_{4})_{3}]\ {\xrightarrow {h\nu }}\ 2K_{2}[Fe(C_{2}O_{4})_{2}]+K_{2}C_{2}O_{4}+2CO_{2}\uparrow }}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/58c51d9191104153739d4b1d0d1e7aef71e98263)
- Reacts with red blood salt in the light:
This method was used in the cyanotype method.
Literature
- CRC Handbook of Chemistry and Physics . - 89th Edition. - Taylor and Francis Group, LLC, 2008-2009.