Magnesium-potassium sulfate-chromate

Magnesium-potassium sulfate-chromate
Names:	potassium-magnesium sulfate-chromate dipotassium-magnesium sulfate-chromate
Formula:	K2CrO4 · MgSO4 (anhydrous) K2CrO4 · MgSO4 · 6H2O (hexahydrate)
Molar mass:	314.554 g/mol (anhydrous) 422.643 g/mol (hexahydrate)
Crystal system:	monoclinic (hexahydrate) α=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/9/9f/Parallelepiped.json Parallelepiped https://en.crystalls.info/w/uploads/media/d/d0/Truncated_deformed_oblique_hexagonal_prism.json Truncated deformed oblique hexagonal prism https://en.crystalls.info/w/uploads/media/9/9a/Truncated_deformed_hexagonal_prism.json Truncated deformed hexagonal prism
Color:	yellow
Stability:	stable (hexahydrate)

Description

Inorganic compound, double salt of transitional metal magnesium, alkaline metal potassium with inorganic sulfuric and phosphoric acids. From water solutions crystallizes as hexahydrate.

Precursors

Reaction between magnesium sulfate and potassium chromate

Chemical equation:

K₂CrO₄ + MgSO₄ = K₂CrO₄ · MgSO₄↓

For preparation of 100.00g of magnesium-potassium sulfate-chromate hexahydrate

hexahydrate

anhydrous

а 58.32g of magnesium sulfate heptahydrate

heptahydrate

anhydrous

and 45.95g of potassium chromate 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

It is possible to cover crystals with a layer of other Tutton's salts, by placing the crystals into s saturated solution of other salt, producing a crystal-in-crystal.

Notes

Have a tendency to form polycrystals.

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

Soluble in water. Insoluble in ethanol, acetone and ethylene glycol.

Gallery

• 

  Magnesium-potassium sulfate-chromateRostislav Dolgikh, VKontakteRostislav DolgikhVKontakte

• 

  Magnesium-potassium sulfate-chromateRostislav Dolgikh, VKontakteRostislav DolgikhVKontakte

• 

  Crystals coated with a layer of zinc-ammonium sulfateMagnesium-potassium sulfate-chromate, Rostislav Dolgikh, VKontakteRostislav DolgikhVKontakte

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])