Sodium dioxalatocuprate(II)

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   Sodium dioxalatocuprate(II)   
Names: sodium dioxalatocuprate(II)
sodium bis(oxalato)cuprate(II)
sodium copperoxalate
copper(II) sodium oxalate
Formula: Na2[Cu(C2O4)2] (anhydrous)
Na2[Cu(C2O4)2] · 2H2O (dihydrate)
Molar mass: 285.562 g/mol (anhydrous)
321.592 g/mol (dihydrate)
Density: 2.24 g/cm3 (dihydrate)
Crystal system: triclinic (dihydrate)
a=7.536 Å, b=9.473 Å, c=3.576 Åα=81.90°, β=103.77°, γ=108.09°
Shapes:
https://media.crystalls.info/w/uploads/media/Needle.json

Color: blue
light blue
Decomposition point: 255 °C528.15 K <br />491 °F <br />950.67 °R <br /> (dihydrate)
Stability: stable (dihydrate)
Hardness: very fragile

Description

Organic coordination complex, salt of alkaline metal sodium, transitional metal copper and organic oxalic acid. From water solutions crystallizes as dihydrate.

Minerals

Occurs in nature as wheatleyite mineral.

Precursors

Reaction between copper(II) sulfate and sodium oxalate

Chemical equation:

CuSO4 + 4Na2C2O4 = Na2[Cu(C2O4)2] + Na2SO4


For preparation of 100.00g of sodium dioxalatocuprate(II) dihydrate а 49.63g of copper(II) sulfate and 166.67g of sodium oxalate is required.

Add to the flask with hot copper(II) sulfate solution a sodium oxalate solution with heating and stirring. Cooling this mixture will cause forming a large amount of crystalline precipitate.

Reaction between copper(II) oxalate and sodium oxalate

Chemical equation:

CuC2O4 + Na2C2O4 = Na2[Cu(C2O4)2]


For preparation of 100.00g of sodium dioxalatocuprate(II) dihydrate а 47.13g of copper(II) oxalate and 41.67g of sodium oxalate is required.

Add to the flask with copper oxalate a sodium oxalate solution with stirring.

Storage conditions

Store in its original form or under several layers of varnish at average humidity and room temperature. Do not store in matchboxes or cotton wool and do not heat.

Solubility

Slightly soluble in water.


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