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Magnesium-potassium sulfate-chromate

From Crystal growing


   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
https://en.crystalls.info/w/uploads/media/9/9f/Parallelepiped.json
https://en.crystalls.info/w/uploads/media/d/d0/Truncated_deformed_oblique_hexagonal_prism.json
https://en.crystalls.info/w/uploads/media/9/9a/Truncated_deformed_hexagonal_prism.json

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 а 58.32g of magnesium sulfate heptahydrate 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.


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