Potassium-sodium trioxalatoferrate (III)

Potassium-sodium trioxalatoferrate(III)
Names:	sodium ferrioxalate-potassium Potassium trioxalatoferrate(III)-sodium potassium trioxalatoferriate-sodium Sodium tris(oxalato)ferrate(III)-potassium sodium tris(oxalato)ferriate-potassium
Formula:	K5Na[Fe(C2O4)3]2
Molar mass:	858.278 g/mol
Crystal system:	cubic a=13.555 Å, b=13.555 Å, c=13.555 Åα=90°, β=90°, γ=90°
Shapes:	https://en.crystalls.info/w/uploads/media/3/37/Octahedron.json Octahedron https://en.crystalls.info/w/uploads/media/a/a8/Rhombic_dodecahedron.json Rhombic dodecahedron
Color:	green
Stability:	stable
Toxicity:	slightly toxic

Description

Organic coordination complex, double salt of alkaline metals sodium and potassium, transitional metal iron and organic oxalic acid. Doesn't form water hydrates.

Precursors

Double crystallization of sodium and potassium trioxalatoferrates(III)

Chemical equation:

5K₃[Fe(C₂O₄)] + Na₃[Fe(C₂O₄)] = 3K₅Na[Fe(C₂O₄)]₂

For preparation of 100.00g of potassium-sodium trioxalatoferrate(III) а 35.29g of sodium trioxalatoferrate(III) pentahydrate

pentahydrate

anhydrous

and 183.62g of potassium trioxalatoferrate(III) trihydrate

trihydrate

anhydrous

is required.

To prepare a dobule salt it is important to keep ration K:Na=2:1, not 5:1 as required by formula. If ratio is 5:1 then a potassium trioxalatoferrate(III) crystals will form.

Influence of impurities

Crystal shape depends on cations concentration. Excess of potassium ions or extra heat produces crystals with a shape of rhombic dodecahedron. Excess of sodium ions produces crystals with a shape of octahedron.

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

Keep in its original form or under several layers of varnish at average humidity and room temperature. Do not keep crystals near heaters.

Solubility

TableGraph

Temperature	g/100,00 g water
25°C298.15 K <br />77 °F <br />536.67 °R <br />	~20

Gallery

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  Potassium-sodium trioxalatoferrate(III)Dmitry Shintyakov, Personal crystal growing collectionDmitry ShintyakovPersonal crystal growing collection

• 

  Grown in 1 month, 35 gramPotassium-sodium trioxalatoferrate(III), Dmitry Shintyakov, Personal crystal growing collectionDmitry ShintyakovPersonal crystal growing collection

• 

  Grown in 1 month, 35 gramPotassium-sodium trioxalatoferrate(III), Dmitry Shintyakov, Personal crystal growing collectionDmitry ShintyakovPersonal crystal growing collection

• 

  Potassium-sodium trioxalatoferrate(III)Vladimir Semikin, VKontakteVladimir SemikinVKontakte

• 

  Grown in 1.5 monthsPotassium-sodium trioxalatoferrate(III), Eugene Dudko, VKontakteEugene DudkoVKontakte

• 

  Grown in 1.5 monthsPotassium-sodium trioxalatoferrate(III), Eugene Dudko, VKontakteEugene DudkoVKontakte

• 

  Potassium-sodium trioxalatoferrate(III)Dmitry Shintyakov, Personal crystal growing collectionDmitry ShintyakovPersonal crystal growing collection

• 

  Potassium-sodium trioxalatoferrate(III)Cwdcloud, reddit.comCwdcloudReddit.com

• 

  Potassium-sodium trioxalatoferrate(III)Vladimir Semikin, VKontakteVladimir SemikinVKontakte

• 

  Potassium-sodium trioxalatoferrate(III)Tinhthehoc, facebook.comTinhthehocFacebook.com

• 

  Potassium-sodium trioxalatoferrate(III)Tinhthehoc, facebook.comTinhthehocFacebook.com

• 

  Potassium-sodium trioxalatoferrate(III)Vladimir Semikin, VKontakteVladimir SemikinVKontakte

Sources

• Personal crystal growing collection
• S. Henneicke, R. Wartchow, Crystal structure of potassium sodium A-tris(oxalato)ferrate(III), K2.5Nao.5Fe(C204)3
• Reddit.com

Navigation

Potassium compounds
Salts	Potassium bromate (KBrO3) • Potassium bromide (KBr) • Potassium chlorate (KClO3) • Potassium chloride (KCl) • Potassium chromate (K2CrO4) • Potassium dihydrophosphate (KH2PO4) • Potassium dichromate (K2Cr2O7) • Potassium iodide (KI) • Potassium hydrofluoride (KHF2) • Potassium hydrophosphate (K2HPO4) • Potassium hydrogen phthalate (KC8H6O4) • Potassium metavanadate (KVO3) • Potassium nitrate (KNO3) • Potassium sulfate (K2SO4) • Potassium thiocyanate (KNCS)
Double salts	Aluminum-potassium sulfate (KAl(SO4)2) • Antimony(III)-potassium tartrate (K2Sb2(C4H2O6)2) • Chromium(III)-potassium sulfate (KCr(SO4)2) • Cobalt(II)-potassium sulfate (K2Co(SO4)2) • Copper(II)-potassium sulfate (K2Cu(SO4)2) • Indium(III)-potassium sulfate (KIn(SO4)2) • Iron(II)-potassium sulfate (K2Fe(SO4)2) • Iron(III)-potassium sulfate (KFe(SO4)2) • Lithium-potassium sulfate (KLiSO4) • Magnesium-potassium sulfate (K2Mg(SO4)2) • Magnesium-potassium sulfate-chromate (K2CrO4 · MgSO4) • Manganese(II)-potassium sulfate (K2Mn(SO4)2) • Nickel-potassium sulfate (K2Ni(SO4)2) • Potassium-sodium tartrate (KNaC4H4O6) • Vanadium(III)-ammonium sulfate (NH4V(SO4)2) • Zinc-potassium sulfate (K2Zn(SO4)2)
Complexes	Potassium dioxalatocuprate(II) (K2[Cu(C2O4)2]) • Potassium hexanitrocobaltate(III) (K3[Co(NO2)6]) • Potassium hexachlororhodiate(III) (K3[RhCl6]) • Potassium hexacyanocobaltate(III) (K3[Co(CN)6]) • Potassium hexacyanoferrate(II) (K4[Fe(CN)6]) • Tripotassium-sodium hexacyanoferrate(II) (K3Na[Fe(CN)6]) • Potassium hexacyanoferrate(III) (K3[Fe(CN)6]) • Potassium hexacyanochromate(III) (K3[Co(CN)6]) • Potassium tetraiodobismuthate (К[BiI4]) • Potassium tetraiodomercurate(II) (K2[HgI4]) • Potassium trioxalatoaluminate (K3[Al(C2O4)3]) • Potassium trioxalatocobaltate(III) (K3[Co(C2O4)3]) Potassium trioxalatoferrate(III) (K3[Fe(C2O4)3]) • Potassium-sodium trioxalatoferrate(III) (K5Na[Fe(C2O4)3]2) • Dipotassium-sodium trioxalatoferrate(III) (K2Na[Fe(C2O4)3]) • Potassium trioxalatochromate(III) (K3[Cr(C2O4)3])

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)

Double salts
Salts	Antimony(III)-potassium tartrate (K2Sb2(C4H2O6)2) • Calcium-ammonium nitrate (5Ca(NO3)2 · NH4NO3) • Cerium(III)-cobalt-manganese nitrate (3(Co,Mn)(NO3)2 · 2Ce(NO3)3) • Cerium(III)-cobalt nitrate (3Co(NO3)2 · 2Ce(NO3)3) • Cerium(III)-manganese nitrate (3Mn(NO3)2 · 2Ce(NO3)3) • Cerium(IV)-ammomium nitrate (2NH4NO3 · Ce(NO3)4) • Copper(II)-iron(II) sulfate ((Cu,Fe)SO4) • Copper-calcium acetate (CuCa(CH3COO)4) • Dipotassium-sodium trioxalatoferrate(III) (K2Na[Fe(C2O4)3]) • Iron(II)-magnesium sulfate ((Fe,Mg)SO4) • Lithium-potassium sulfate (KLiSO4) • Potassium-sodium tartrate (KNaC4H4O6) • Potassium-sodium trioxalatoferrate(III) (K5Na[Fe(C2O4)3]2) • Rubidium-gold(III)-palladium(II) chloride (2RbCl · AuCl3 · PdCl2) • Sodium-ammonium sulfate (NaNH4SO4) • Tripotassium-sodium hexacyanoferrate(II) (K3Na[Fe(CN)6]) • Uranyl-sodium acetate (NaUО2(CH3COO)3) • Uranyl-zinc-sodium acetate (NaZn(UO2)3(CH3COO)9) • Zinc-sodium sulfate (Na2Zn(SO4)2)
Categories	Alums • Tutton's salts‎