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Sodium oxalate

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   Sodium oxalate   
Names: sodium oxalate
disodium oxalate
sodium ethanedioate
Formula: Na2C2O4
Molar mass: 133.998 g/mol
Density: 2.34 g/cm3
Crystal system: monoclinic
a=10.35 Å, b=5.26 Å, c=3.46 Åα=90°, γ=90°
Shapes:
https://en.crystalls.info/w/uploads/media/b/bc/Rhombic_prism.json
Rhombic prism
https://en.crystalls.info/w/uploads/media/4/48/Prolongated_rhombic_prism.json
Prolongated rhombic prism

Color: colorless
Melting point: 260 °C533.15 K <br />500 °F <br />959.67 °R <br />
Decomposition point: 290 °C563.15 K <br />554 °F <br />1,013.67 °R <br />
Stability: stable
Hardness: fragile

Description

Organic compound, salt of alkaline metal sodium and organic oxalic acid. Doesn't form water hydrates.

Minerals

Occurs in nature as natroxalate mineral.

Precursors

Reaction between baking soda, carbonate or sodium hydroxide and oxalic acid

Chemical equation:

H2C2O4 + 2NaHCO3 = Na2C2O4 + 2H2O + 2CO2↑
H2C2O4 + Na2CO3 = Na2C2O4 + H2O + CO2↑
H2C2O4 + 2NaOH = Na2C2O4 + 2H2O


For preparation of 100.00g of sodium oxalate а 125.38g of soda or 79.10g of carbonate or 59.70g of sodium hydroxide and 94.08g of oxalic acid dihydrate is required.

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.

Notes

This compound is a good nutrient for molds, so a little amount of food preservative like potassium sorbate might be needed. Boiling after molds appear is also effective.

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 waterg/100,00 g formic acid 95%
0°C273.15 K <br />32 °F <br />491.67 °R <br />~2.70
10°C283.15 K <br />50 °F <br />509.67 °R <br />~3.06
15°C288.15 K <br />59 °F <br />518.67 °R <br />~3.24
20°C293.15 K <br />68 °F <br />527.67 °R <br />~3.438.8
25°C298.15 K <br />77 °F <br />536.67 °R <br />~3.61
30°C303.15 K <br />86 °F <br />545.67 °R <br />~3.79
40°C313.15 K <br />104 °F <br />563.67 °R <br />~4.15
50°C323.15 K <br />122 °F <br />581.67 °R <br />~4.52
60°C333.15 K <br />140 °F <br />599.67 °R <br />~4.88
70°C343.15 K <br />158 °F <br />617.67 °R <br />~5.25
80°C353.15 K <br />176 °F <br />635.67 °R <br />~5.61
90°C363.15 K <br />194 °F <br />653.67 °R <br />~5.97
100°C373.15 K <br />212 °F <br />671.67 °R <br />~6.34
Insoluble in ethanol, diethyl ether, benzene and hexane.



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)



   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])

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