Copper(II)-potassium sulfate

Copper(II)-potassium sulfate
Names:	copper potassium sulfate copper Tutton's salt potassium copper schoenite potassium cupric sulfate KCuSH
Formula:	K2Cu(SO4)2 (anhydrous) K2Cu(SO4)2 · 6H2O (hexahydrate)
Molar mass:	333.864 g/mol (anhydrous) 441.953 g/mol (hexahydrate)
Crystal system:	monoclinic (hexahydrate) a=6.1674 Å, b=12.1302 Å, c=9.0851 Åα=90°, β=104.45°, γ=90°
Shapes:	https://en.crystalls.info/w/uploads/media/3/35/Deformed_tetragonal_bipyramid.json Deformed tetragonal bipyramid https://en.crystalls.info/w/uploads/media/7/7b/Beveled_rhombic_prism.json Beveled rhombic prism https://en.crystalls.info/w/uploads/media/b/bc/Rhombic_prism.json Rhombic prism
Color:	light-blue
Stability:	stable (hexahydrate)

Description

Inorganic compound, double salt of transitional metal copper, alkaline metal potassium ion and inorganic sulfuric acid. From water solutions crystallizes as hexahydrate.

Precursors

Reaction between copper(II) and potassium sulfates

Chemical equation:

K₂SO₄ + CuSO₄ = K₂Cu(SO₄)₂↓

For preparation of 100.00g of copper(II)-potassium sulfate hexahydrate

hexahydrate

anhydrous

а 56.49g of copper(II) sulfate pentahydrate

pentahydrate

monohydrate

anhydrous

and 39.43g of potassium sulfate is required.

Dissolve compounds in hot water apart and then mix solutions into one container with intense stirring. Cooling or evaporation of a solution will cause double salt crystallyzation. Filter precipitate and wash it wish small amount of ethanol or acetone, then filter the solution and use it for crystal growing.

Influence of impurities

Excess of one of sulfates leads to changing a shape of the final crystal. Excess of potassium sulfate makes crystals cloudy/opaque. Small addition of zinc-potassium sulfate or magnesium-potassium sulfate changes crystal color to a lighter one. Compound could be mixed with Tutton's salts in any proportion, producing crystals with different colors and sometimes shapes. It is also possible to cover crystals with a layer of other Tutton's salt, e.g. by placing the crystal into s saturated solution of other salt, producing a crystal-in-crystal.

Influence of pH level

Addition of chemicals producing buffer solutions makes a huge impact on crystal shape and opacity. Examples of such compounds are potassium dihydrophosphate and acetic acid.

Notes

Due to serious Jahn–Teller effect in a the hexaaquacopper(II) ion, this salt is very 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

Insoluble in ethanol and acetone.

Gallery

• 

  Copper(II)-potassium sulfateAnatoly Bobe, VKontakteAnatoly BobeVKontakte

• 

  Copper(II)-potassium sulfateRostislav Dolgikh, VKontakteRostislav DolgikhVKontakte

• 

  Copper(II)-potassium sulfateSergey Sachkov, VKontakteSergey SachkovVKontakte

• 

  Copper(II)-potassium sulfateSergey Sachkov, VKontakteSergey SachkovVKontakte

• 

  Copper(II)-potassium sulfateSergey Sachkov, VKontakteSergey SachkovVKontakte

• 

  Copper(II)-potassium sulfateSergey Sachkov, VKontakteSergey SachkovVKontakte

Sources

• Ferdinando Bosi, Girolamo Belardi and Paolo Ballirano, Structural features in Tutton’s salts K2(M2+(H2O)6)(SO4)2, with M2+ = Mg, Fe, Co, Ni, Cu, and Zn
• Darren C. Peets, Maxim Avdeev, Marein C. Rahn, Falk Pabst, Sergey Granovsky, Markus Stötzer, Dmytro S. Inosov, Crystal Growth, Structure, and Noninteracting Quantum Spins in Cyanochroite, K2Cu(SO4)2·6H2O
• VKontakte

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])

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)