Sodium dicarbonatocuprate (II)

Sodium dicarbonatocuprate(II) ;
Names:	sodium dicarbonatocuprate(II); sodium bis(carbonato)cuprate(II); sodium coppercarbonate(II); copper(II)-sodium carbonate;
Formula:	Na2[Cu(CO3)2] (anhydrous); Na2[Cu(CO3)2] · 3H2O (trihydrate);
Molar mass:	229.542 g/mol (anhydrous); 283.587 g/mol (trihydrate);
Density:	2.984 g/cm3 (anhydrous); 2.27 g/cm3 (trihydrate);
Crystal system:	monoclinic (anhydrous); a=6.152 Å, b=8.1237 Å, c=5.6327 Åα=90°, β=115.805°, γ=90°; monoclinic (trihydrate); a=9.6949 Å, b=6.0949 Å, c=13.7832 Åα=90°, β=91.793°, 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/4/48/Prolongated_rhombic_prism.json Prolongated rhombic prism ;
Color:	light-blue; pale blue-green;
Magnetic properties:	paramagnetic;
Hardness:	very fragile;
Toxicity:	slightly toxic

Description

Inorganic complex compound of alkaline metal sodium, transitional metal copper and inorganic carbonic acid. From water solutions crystallizes as trihydrate.

Minerals

Occurs in nature as chalconatronite and juangodoyite minerals.

Precursors

Reaction between copper(II) hydroxycarbonate and baking soda or sodium carbonate

Chemical equation:

Cu₂(OH)₂CO₃ + 6NaHCO₃ = 2Na₂[Cu(CO₃)₂] + 2NaOH + H₂O + CO₂↑

Cu₂(OH)₂CO₃ + 3Na₂CO₃ = 2Na₂[Cu(CO₃)₂] + 2NaOH

For preparation of 100.00g of sodium dicarbonatocuprate(II)

trihydratetrihydrate
anhydrous

а 88.87g of sodium hydrocarbonate or 56.06g of sodium carbonate and 38.99g of copper(II) hydroxycarbonate is required.

Add to flask with hot concentrated solution of sodium hydrocarbonate or carbonate small amount of copper(II) hydroxycarbonate with intense stirring. Heat it to 100°C for few minutes for reaction completion and then filter out. After reaction will stop, filter the solution and use it for crystal growing.

Notes

Stable only in solution of baking soda, decomposes in the pure water. Grows mainly as polycrystaline.

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

Insoluble in water.

Gallery

Dissolving a copper (II) hydroxycarbonate in the saturated solution of sodium carbonateSodium dicarbonatocuprate(II), Rostislav Dolgikh, VKontakteRostislav DolgikhVKontakte
Dissolving a copper (II) hydroxycarbonate in the saturated solution of sodium carbonateSodium dicarbonatocuprate(II), Rostislav Dolgikh, VKontakteRostislav DolgikhVKontakte
Dissolving a copper (II) hydroxycarbonate in the saturated solution of sodium carbonateSodium dicarbonatocuprate(II), Rostislav Dolgikh, VKontakteRostislav DolgikhVKontakte
Mixing of saturated water solutions of copper(II) acetate and sodium hydrocarbonate with 1:7.5 volume ratio. Spherolites with up to 8 mm diameter grow in a daySodium dicarbonatocuprate(II), Avak Avakyan, internet ArchiveAvak AvakyanInternet Archive
Mixing of saturated water solutions of copper(II) acetate and sodium hydrocarbonate with 1:7.5 volume ratio. Spherolites with up to 8 mm diameter grow in a daySodium dicarbonatocuprate(II), Avak Avakyan, internet ArchiveAvak AvakyanInternet Archive
Mixing of saturated water solutions of copper(II) acetate and sodium hydrocarbonate with 1:7.5 volume ratio. Spherolites with up to 8 mm diameter grow in a daySodium dicarbonatocuprate(II), Avak Avakyan, internet ArchiveAvak AvakyanInternet Archive
Mixing of saturated water solutions of copper(II) acetate and sodium hydrocarbonate with 1:7.5 volume ratio. Spherolites with up to 8 mm diameter grow in a daySodium dicarbonatocuprate(II), Avak Avakyan, internet ArchiveAvak AvakyanInternet Archive
Mixing of saturated water solutions of copper(II) acetate and sodium hydrocarbonate with 1:7.5 volume ratio. Spherolites with up to 8 mm diameter grow in a daySodium dicarbonatocuprate(II), Avak Avakyan, internet ArchiveAvak AvakyanInternet Archive
Reaction of a copper(II) chloride solution with excess baking sodaSodium dicarbonatocuprate(II), MrHomeScientist, Sciencemadness forumMrHomeScientistSciencemadness forum

Sources

Carbonates
Salts	Calcium carbonate (CaCO₃) • Magnesium hydrocarbonate (Mg(HCO₃)₂) • Sodium carbonate (Na₂CO₃) • Sodium hydrocarbonate (NaHCO₃)
Complexes	Sodium dicarbonatocuprate(II) (Na₂[Cu(CO₃)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])

Copper compounds
Salts	Copper (Cu) • Copper(II) acetate (Cu(CH₃COO)₂) • Copper(II) dihydrophosphate (Cu(H₂PO₄)₂) • Copper(II) formate (Cu(COOH)₂) • Copper(II) lactate (Cu(C₃H₅O₃)₂) • Copper(II) nitrate (Cu(NO₃)₂) • Copper(II) sulfamate (Cu(NH₂SO₃)₂) • Copper(II) sulfate (CuSO₄) • Copper(II) tartrate (CuC₄H₄O₆) • Copper(II) chloride (CuCl₂)
Double salts	Copper-calcium acetate (CuCa(CH₃COO)₄) • Copper(II)-iron(II) sulfate ((Cu,Fe)SO₄) • Copper(II)-ammonium sulfate ((NH₄)₂Cu(SO₄)₂) • Copper(II)-potassium sulfate (K₂Cu(SO₄)₂)
Complexes	Dicarbonatocuprates • Dioxalatocuprates • Bis-thetramethylethylenediaminecopper(II) nitrate ([Cu((H₃CNCH₃)₂C₄H₈)](NO₃)₂) • Glycinecopper(II) sulfate ([Cu(NH₂CH₂COOH)]SO₄) • Copper(II) formate and urea adduct (Cu(HCOO)₂ · 2CO(NH₂)₂) • Potassium dioxalatocuprate(II) (K₂[Cu(C₂O₄)₂]) • Sodium dioxalatocuprate(II) (Na₂[Cu(C₂O₄)₂]) • Sodium dicarbonatocuprate(II) (Na₂[Cu(CO₃)₂]) • Tetraamminecopper(II) sulfate ([Cu(NH₃)₄]SO₄) • Tetrachlorocuprates • Tris(hydroxymethyl)methanoaminecopper(II) sulfate ([Cu(NH₂C(CH₂OH)₃)₄]SO₄)

Sodium dicarbonatocuprate(II)
Names:	sodium dicarbonatocuprate(II) sodium bis(carbonato)cuprate(II) sodium coppercarbonate(II) copper(II)-sodium carbonate
Formula:	Na₂[Cu(CO₃)₂] (anhydrous) Na₂[Cu(CO₃)₂] · 3H₂O (trihydrate)
Molar mass:	229.542 g/mol (anhydrous) 283.587 g/mol (trihydrate)
Density:	2.984 g/cm³ (anhydrous) 2.27 g/cm³ (trihydrate)
Crystal system:	monoclinic (anhydrous) a=6.152 Å, b=8.1237 Å, c=5.6327 Åα=90°, β=115.805°, γ=90° monoclinic (trihydrate) a=9.6949 Å, b=6.0949 Å, c=13.7832 Åα=90°, β=91.793°, γ=90°
Shapes:	Beveled tetragonal prism Prolongated rhombic prism
Color:	light-blue pale blue-green
Magnetic properties:	paramagnetic
Hardness:	very fragile
Toxicity:	slightly toxic