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Magnesium-potassium sulfate-chromate | |
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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: |
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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:
100.00
g of magnesium-potassium sulfate-chromate hexahydrate
а 58.32
g of magnesium sulfate heptahydrate
and 45.95
g 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
Gallery
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Crystals coated with a layer of zinc-ammonium sulfateMagnesium-potassium sulfate-chromate, Rostislav Dolgikh, VKontakteVKontakte
Chromates | |
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Dichromates |
Ammonium dichromate ((NH4)2Cr2O7) • Potassium dichromate (K2Cr2O7) • Strontium dichromate (SrCr2O7) |
Chromates |
Potassium chromate (K2CrO4) |
Magnesium compounds | |
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Salts |
Magnesium hydrocarbonate (Mg(HCO3)2) • Magnesium sulfamate (Mg(NH2SO3)2) • Magnesium sulfate (MgSO4) |
Double salts |
Iron(II)-magnesium sulfate ((Fe,Mg)SO4) • Magnesium-ammonium sulfate ((NH4)2MgSO4) • Magnesium-potassium sulfate (K2MgSO4) • Magnesium-potassium sulfate-chromate (K2CrO4 · MgSO4) |