Sodium trioxalatoferrate (III)

Sodium trioxalatoferrate(III) ;
Names:	sodium ferrioxalate; Sodium oxalatoferrate(iii); Sodium trioxalatoferrate(iii); sodium trioxalatoferriate; Sodium tris(oxalato)ferrate(iii); sodium tris(oxalato)ferriate;
Formula:	Na3[Fe(C2O4)3] (anhydrous); Na3[Fe(C2O4)3] · 5H2O (pentahydrate);
Molar mass:	388.869 g/mol (anhydrous); 478.943 g/mol (pentahydrate);
Density:	1.973 g/cm3 (pentahydrate);
Crystal system:	monoclinic (pentahydrate); a=17.3594 Å, b=12.6866 Å, c=15.1757 Åα=90°, β=100.449°, γ=90°;
Shapes:	https://en.crystalls.info/w/uploads/media/b/bc/Rhombic_prism.json Rhombic prism https://en.crystalls.info/w/uploads/media/3/36/Oblique_rhombic_prism.json Oblique rhombic prism https://en.crystalls.info/w/uploads/media/0/0e/Truncated_rhombic_bipyramid.json Truncated rhombic bipyramid https://en.crystalls.info/w/uploads/media/f/fd/Beveled_truncated_rhombic_prism.json Beveled truncated rhombic prism ;
Color:	green;
Decomposition point:	100 °C373.15 K <br />212 °F <br />671.67 °R <br /> (pentahydrate);
Stability:	erodes (pentahydrate)

Description

Organic coordination комплекс, salt of transitional metal iron, alkaline metal sodium and organic oxalic acid. From water solutions crystallizes as pentahydrate.

Precursors

Reaction between iron(III) chloride, sodium hydroxide, carbonate or hydrocarbonate, and oxalic acid

Chemical equation:

FeCl₃ + 6NaOH + 3H₂C₂O₄ = Na₃[Fe(C₂O₄)₃] + 3NaCl + 6H₂O

FeCl₃ + 3Na₂CO₃ + 3H₂C₂O₄ = Na₃[Fe(C₂O₄)₃] + 3NaCl + 3H₂O + 3CO₂↑

FeCl₃ + 6NaHCO₃ + 3H₂C₂O₄ = Na₃[Fe(C₂O₄)₃] + 3NaCl + 6H₂O + 3CO₂↑

For preparation of 100.00g of sodium trioxalatoferrate(III)

pentahydratepentahydrate
anhydrous

а 56.44g of iron(III) chloride

hexahydratehexahydrate
anhydrous

, 50.11g of sodium hydroxide or 66.39g of sodium carbonate or 105.24g of sodium hydrocarbonate and 78.96g of oxalic acid

dihydratedihydrate
anhydrous

is required.

Add to the flask with oxalic acid solution a hot iron(III) chloride solution with stirring.Add acid to the flask, then add small parts of sodium compound with stirring until heating will stop (attention, the solution may boil!) or, if you use carbonate, until carbon dioxide emission will stop. After reaction will stop, filter the solution and use it for crystal growing.

Solution contains both sodium trioxalatoferrate(III) and sodium chloride. The latter has lower solubility, and will precipitate first. Crystal system is different for these componds, so crystals will grow separately..

Reaction between iron(III) hydroxide or oxide, sodium hydroxide, carbonate or hydrocarbonate, and oxalic acid

Chemical equation:

Fe₂O₃ + 6NaOH + 6H₂C₂O₄ = 2Na₃[Fe(C₂O₄)₃] + 9H₂O

Fe₂O₃ + 3Na₂CO₃ + 6H₂C₂O₄ = 2Na₃[Fe(C₂O₄)₃] + 6H₂O + 3CO₂↑

Fe₂O₃ + 6NaHCO₃ + 6H₂C₂O₄ = 2Na₃[Fe(C₂O₄)₃] + 9H₂O + 6CO₂↑

Fe(OH)₃ + 3NaOH + 3H₂C₂O₄ = Na₃[Fe(C₂O₄)₃] + 6H₂O

2Fe(OH)₃ + 3Na₂CO₃ + 6H₂C₂O₄ = 2Na₃[Fe(C₂O₄)₃] + 9H₂O + 3CO₂↑

Fe(OH)₃ + 3NaHCO₃ + 3H₂C₂O₄ = Na₃[Fe(C₂O₄)₃] + 6H₂O + 3CO₂↑

For preparation of 100.00g of sodium trioxalatoferrate(III)

pentahydratepentahydrate
anhydrous

а 16.67g of iron(III) oxide or 22.31g of iron(III) hydroxide, 25.05g of sodium hydroxide or 33.19g of sodium carbonate or 52.62g of sodium hydrocarbonate and 78.96g of oxalic acid

dihydratedihydrate
anhydrous

is required.

Add acid to the flask, then add small parts of iron compound with stirring until it will totally dissolve .Add acid to the flask, then add small parts of sodium compound with stirring until heating will stop (attention, the solution may boil!) or, if you use carbonate, until carbon dioxide emission will stop. After reaction will stop, filter the solution and use it for crystal growing.

Reaction between iron(III) hydroxide or oxide and sodium hydrooxalate

Chemical equation:

Fe₂O₃ + 6NaHC₂O₄ = 2Na₃[Fe(C₂O₄)₃] + 3H₂O

Fe(OH)₃ + 3NaHC₂O₄ = Na₃[Fe(C₂O₄)₃] + 3H₂O

For preparation of 100.00g of sodium trioxalatoferrate(III)

pentahydratepentahydrate
anhydrous

а 16.67g of iron(III) oxide or 22.31g of iron(III) hydroxide and 81.45g of sodium hydrooxalate

monohydratemonohydrate
anhydrous

is required.

Add to the flask with iron(III) compounds solution a hot sodium hydrooxalate solution with stirring. After reaction will stop, filter the solution and use it for crystal growing.

Reaction between iron(III) hydroxide or oxide, sodium oxalate and oxalic acid

Chemical equation:

Fe₂O₃ + 3Na₂C₂O₄ + 3H₂C₂O₄ = 2Na₃[Fe(C₂O₄)₃] + 3H₂O

2Fe(OH)₃ + 3Na₂C₂O₄ + 3H₂C₂O₄ = 2Na₃[Fe(C₂O₄)₃] + 6H₂O

For preparation of 100.00g of sodium trioxalatoferrate(III)

pentahydratepentahydrate
anhydrous

а 16.67g of iron(III) oxide or 22.31g of iron(III) hydroxide, 47.61g of sodium oxalate

monohydratemonohydrate
anhydrous

and 39.48g of oxalic acid

dihydratedihydrate
anhydrous

is required.

Add to the flask with iron(III) compounds solution a hot sodium oxalate and oxalic acid solution with stirring. After reaction will stop, filter the solution and use it for crystal growing.

Notes

Direct sunlight or other sources of ultravioler radiation lead to solution changing color from green to yellow, and also lead crystals to shatter. So solution and crystals should be stored in dark place.

Storage conditions

For crystal storing use hermetic vessel with wadding moistened with such solution near the crystal. You can use such alternatives as vessel with vaseline or vegetable oil, organic non-hygroscopic solvent (kerosene or liquid paraffin). Also you can use acrylate polymer or another kinds of solidifying plastic.

Solubility

TableGraph

Temperature	g/`100,00` g water
0°C273.15 K <br />32 °F <br />491.67 °R <br />	`25.5`
20°C293.15 K <br />68 °F <br />527.67 °R <br />	`~60`
100°C373.15 K <br />212 °F <br />671.67 °R <br />	`145.1`

Gallery

Video

Sources

Oxalates
Salts	Ammonium oxalate ((NH₄)₂C₂O₄) • Cobalt(II) oxalate (CoC₂O₄) • Diglycine oxalate ((NH₂CH₂COOH)₃ · H₂C₂O₄) • Neodymium oxalate (Nd₂(C₂O₄)₃) • Oxalic acid (H₂C₂O₄) • Sodium oxalate (Na₂C₂O₄) • Tris(ethylenediamine)nickel oxalate ([Ni(H₂NCH₂CH₂NH₂)₃]C₂O₄)
Dioxalatocuprates	Ammonium dioxalatocuprate(II) ((NH₄)₂[Cu(C₂O₄)₂]) • Potassium dioxalatocuprate(II) (K₂[Cu(C₂O₄)₂]) • Sodium dioxalatocuprate(II) (Na₂[Cu(C₂O₄)₂])
Trioxalatoaluminates	Potassium trioxalatoaluminate (K₃[Al(C₂O₄)₃]) • Sodium trioxalatoaluminate (Na₃[Al(C₂O₄)₃])
Trioxalatochromates	Potassium trioxalatochromate(III) (K₃[Cr(C₂O₄)₃]) • Sodium trioxalatochromate(III) (Ns₃[Cr(C₂O₄)₃])
Trioxalatocobaltates	Potassium trioxalatocobaltate(III) (K₃[Co(C₂O₄)₃])
Trioxalatoferrates	Ammonium trioxalatoferrate(III) ((NH₄)₃[Fe(C₂O₄)₃]) • Lithium trioxalatoferrate(III) (Li₃[Fe(C₂O₄)₃]) • Lithium trioxalatoferrate(III)-chloride (Li₄[Fe(C₂O₄)₃]Cl) Potassium trioxalatoferrate(III) (K₃[Fe(C₂O₄)₃]) • Potassium-sodium trioxalatoferrate(III) (K₅Na[Fe(C₂O₄)₃]₂) • Sodium trioxalatoferrate(III) (Na₃[Fe(C₂O₄)₃])
Ethers	Dimethyl oxalate ((CH₃)₂C₂O₄)

Iron compounds
Salts	Iron (Fe) • Iron(II) acetate (Fe(CH₃COO)₂) • Iron(II) chloride (FeCl₂) • Iron(III) chloride (FeCl₃) • Iron(II) citrate (FeHC₃H₅O(COO)₃) • Iron(II) formate (Fe(COOH)₂) • Iron(III) formate (Fe₂(COOH)₃) • Iron(II) nitrate (Fe(NO₃)₂) • Iron(II) phosphate (Fe₃(PO₄)₂) • Iron(II) sulfate (FeSO₄) • Iron(III) sulfate (Fe₂(SO₄)₃)
Double salts	Iron(III)-ammonium sulfate ((NH₄)Fe(SO₄)₂) • Iron(II)-ammonium sulfate ((NH₄)₂Fe(SO₄)₂) • Iron(II)-potassium sulfate (K₂Fe(SO₄)₂) • Iron(II)-magnesium sulfate ((Fe,Mg)SO₄) • Copper(II)-iron(II) sulfate ((Cu,Fe)SO₄)
Complexes	Hexacyanoferrates • Nitroprussides‎ • Pentachloroferrates • Trioxalatoferrates • Sodium ethylenediaminetetraacetate-ferrate(III) (Na[Fe((OOCCH₂)₂N(CH₂)₂N(CH₂COO)₂)])

Sodium compounds
Salts	Sodium acetate (NaCH₃COO) • Sodium bromide (NaBr) • Sodium citrate (Na₃C₃H₅O(COO)₃) • Sodium chlorate (NaClO₃) • Sodium chloride (NaCl) • Sodium cyclamate (C₆H₁₂NNaO₃S) • Sodium decavanadate (Na₆V₁₀O₂₈) • Sodium ethilate (NaC₂H₅O) • Sodium glutamate (NaC₅H₈NO₄) • Sodium hydrocarbonate (NaHCO₃) • Sodium hydrosulfate (NaHSO₄) • Sodium iodide (NaI) • Sodium metavanadate (NaVO₃) • Sodium niobate (NaNbO₃) • Sodium nitrate (NaNO₃) • Sodium oxalate (Na₂C₂O₄) • Sodium para-aminosalicylate (C₇H₆NNaO₃) • Sodium perchlorate (NaClO₄) • Sodium saccharinate (C₇H₄NaNO₃S) • Sodium sulfate (Na₂SO₄) • Sodium sulfide (Na₂S) • Sodium tetraborate (Na₂B₄O₇) • Sodium thiosulfate (Na₂S₂O₃) • Sodium trichloroacetate (NaCCl₃COO) • Sodium trioxalatoaluminate (Na₃[Al(C₂O₄)₃]) • Sodium tungstate (Na₂WO₄)
Double salts	Potassium-sodium tartrate (KNaC₄H₄O₆) • Sodium-ammonium sulfate (NaNH₄SO₄) • Uranyl-sodium acetate (NaUО2(CH₃COO)₃) • Uranyl-zinc-sodium acetate (NaZn(UO₂)₃(CH₃COO)₉) • Zinc-sodium sulfate (Na₂Zn(SO₄)₂)
Adducts	Glucose and sodium bromide adduct (2C₆H₁₂O₆ · NaBr) • Glucose and sodium chloride adduct (2C₆H₁₂O₆ · NaCl) • Urea and sodium chloride adduct (CO(NH₄)₂ · NaCl)
Complex compounds	Sodium dicarbonatocuprate(II) (Na₂[Cu(CO₃)₂]) • Sodium dioxalatocuprate(II) (Na₂[Cu(C₂O₄)₂]) • Sodium ethylenediaminetetraacetate-ferrate(III) (Na[Fe((OOCCH₂)₂N(CH₂)₂N(CH₂COO)₂)]) • Sodium hexacyanoferrate(II) (Na₄[Fe(CN)₆]) • Tripotassium-sodium hexacyanoferrate(II) (K₃Na[Fe(CN)₆]) • Sodium hexafluorosilicate (Na₂[SiF₆]) • Sodium nitroprusside (Na₂[Fe(CN)₅NO]) • Sodium trioxalatochromate(III) (Ns₃[Cr(C₂O₄)₃]) • Dipotassium-sodium trioxalatoferrate(III) (K₂Na[Fe(C₂O₄)₃]) • Potassium-sodium trioxalatoferrate(III) (K₅Na[Fe(C₂O₄)₃]₂) • Sodium trioxalatoferrate(III) (Na₃[Fe(C₂O₄)₃])

Sodium trioxalatoferrate(III)
Names:	sodium ferrioxalate Sodium oxalatoferrate(iii) Sodium trioxalatoferrate(iii) sodium trioxalatoferriate Sodium tris(oxalato)ferrate(iii) sodium tris(oxalato)ferriate
Formula:	Na₃[Fe(C₂O₄)₃] (anhydrous) Na₃[Fe(C₂O₄)₃] · 5H₂O (pentahydrate)
Molar mass:	388.869 g/mol (anhydrous) 478.943 g/mol (pentahydrate)
Density:	1.973 g/cm³ (pentahydrate)
Crystal system:	monoclinic (pentahydrate) a=17.3594 Å, b=12.6866 Å, c=15.1757 Åα=90°, β=100.449°, γ=90°
Shapes:	Rhombic prism Oblique rhombic prism Truncated rhombic bipyramid Beveled truncated rhombic prism
Color:	green
Decomposition point:	100 °C373.15 K <br />212 °F <br />671.67 °R <br /> (pentahydrate)
Stability:	erodes (pentahydrate)

Description

Precursors

Reaction between iron(III) chloride, sodium hydroxide, carbonate or hydrocarbonate, and oxalic acid

Reaction between iron(III) hydroxide or oxide, sodium hydroxide, carbonate or hydrocarbonate, and oxalic acid

Reaction between iron(III) hydroxide or oxide and sodium hydrooxalate

Reaction between iron(III) hydroxide or oxide, sodium oxalate and oxalic acid

Notes

Storage conditions

Solubility

Gallery

Video

Sources

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