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Potassium trioxalatoaluminate

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   Potassium trioxalatoaluminate   
Names: potassium alumoxalate
potassium oxalatoaluminate
potassium trioxalatoaluminate
potassium tris(oxalato)aluminate
Formula: K3[Al(C2O4)3] (anhydrous)
K3[Al(C2O4)3] · 3H2O (trihydrate)
Molar mass: 408.330 g/mol (anhydrous)
462.375 g/mol (trihydrate)
Crystal system: monoclinic (trihydrate)
α=90°, γ=90°
Shapes:
https://en.crystalls.info/w/uploads/media/5/50/Beveled_tetragonal_prism.json
Beveled tetragonal prism
https://en.crystalls.info/w/uploads/media/c/ca/Truncated_rhombic_prism.json
Truncated rhombic prism
https://en.crystalls.info/w/uploads/media/a/a4/Truncated_tetragonal_bipyramid.json
Truncated tetragonal bipyramid
https://en.crystalls.info/w/uploads/media/9/9a/Truncated_deformed_hexagonal_prism.json
Truncated deformed hexagonal prism

Color: colorless
Decomposition point: 400 °C673.15 K <br />752 °F <br />1,211.67 °R <br /> (anhydrous)
120 °C393.15 K <br />248 °F <br />707.67 °R <br /> (trihydrate)
Stability: stable (trihydrate)

Description

Organic coordinate complex, salt of transitional metal aluminum, alkaline metal Potassium and organic oxalic acid. From water solutions crystallizes as trihydrate.

Precursors

Reaction between metal aluminum, potassium hydroxide and oxalic acid.

Chemical equation:

2Al + 6KOH + 6H2C2O4 = 2K3[Al(C2O4)3] + 6H2O + ЗН2↑


For preparation of 100.00g of potassium trioxalatoaluminate trihydrate а 5.84g of aluminum, 36.40g of hydroxide potassium and 81.79g of oxalic acid dihydrate is required.

Add hot alkali solution to the flask, then add aluminum pieces, shavings or powder and stir it until gas emission will stop.Add to the flask with oxalic acid a aluminum в alkali solution with stirring. After reaction will stop, filter the solution and use it for crystal growing.

Reaction between aluminum hydroxide and potassium hydrooxalate

Chemical equation:

Al(OH)3 + 3KHC2O4 = K3[Al(C2O4)3] + 3H2O


For preparation of 100.00g of potassium trioxalatoaluminate trihydrate а 16.87g of aluminum hydroxide and 94.82g of potassium hydrooxalate monohydrate is required.

Add to the flask with hydroxide aluminum solution a hot potassium hydrooxalate solution with stirring. After reaction will stop, filter the solution and use it for crystal growing.

Reaction between aluminum hydroxide, potassium hydroxide or carbonate, and oxalic acid

Chemical equation:

2Al(OH)3 + 6KOH + 6H2C2O4 = 2K3[Al(C2O4)3] + 6H2O
2Al(OH)3 + 3K2CO3 + 3H2C2O4 = 2K3[Al(C2O4)3] + 6H2O + 3CO2↑


For preparation of 100.00g of potassium trioxalatoaluminate trihydrate а 16.87g of aluminum hydroxide, 36.40g of potassium hydroxide or 44.84g of potassium carbonate and 81.79g of oxalic acid dihydrate is required.

Add to the flask with aluminum hydroxide solution a hot potassium oxalate and oxalic acid solution with stirring. After reaction will stop, filter the solution and use it for crystal growing.

Influence of impurities

K3[M(C2O4)3].3H2O (M=Al, V, Cr, Mn, Fe) are all isomorphous, meaning they can be mixed to produce crystals with different colors. Also one can be grown onto a crystal of another instead of dissolving it. Unlike alums, but like Tutton's salts, they can have very different shapes.

Influence of pH level

Acidic solutions lead to growing flat plates.

Notes

After crystals is extracted from a solution, it may start cracking, and after some time become opaque.

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

Temperatureg/100,00 g water
20°C293.15 K <br />68 °F <br />527.67 °R <br />~20



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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)



   Aluminum compounds
Simple

Aluminum sulfate (Al2(SO4)3) • Aluminum-ammonium sulfate (NH4Al(SO4)2) • Aluminum-potassium sulfate (KAl(SO4)2)

Complex


   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])

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