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Chromium(III) sulfate

From Crystal growing


   Chromium(III) sulfate   
Names: chromium(III) sulfate
chromium trisulfate
Formula: Cr2(SO4)3 (anhydrous)
Cr2(SO4)3 · 18H2O (octadecahydrate)
Molar mass: 392.175 g/mol (anhydrous)
716.443 g/mol (octadecahydrate)
Density: 1.709 g/cm3 (octadecahydrate)
1.867 g/cm3 (pentadecahydrate)
3.012 g/cm3 (anhydrous)
Crystal system: rhombohedral (anhydrous)
a=8.143 Å, b=8.143 Å, c=8.143 Å
Shapes:
https://en.crystalls.info/w/uploads/media/b/bc/Rhombic_prism.json

Color: dark-violet
dark-green
Melting point: 90 °C363.15 K <br />194 °F <br />653.67 °R <br /> (octadecahydrate)
Decomposition point: 100 °C373.15 K <br />212 °F <br />671.67 °R <br /> (octadecahydrate)
700 °C973.15 K <br />1,292 °F <br />1,751.67 °R <br /> (anhydrous)
Refractive index: 1.564 (octadecahydrate)
Magnetic properties: paramagnetic
χ=1.18 · 10-1cm³/mol
Stability: hygroscopic (octadecahydrate)

Description

Inorganic compound, salt of transitional metal chromium and inorganic sulfuric acid. From water solutions crystallizes as octadecahydrate.

Influence of temperature

The color of solution depends on the temperature - hot solution is green, cold is violet.

Influence of impurities

Can produce adducts with sulfuric acid.

Notes

In most cases, solution becomes a viscous syrup which doesn't produce any crystals, even with addition of ethanol.

Solubility

Temperatureg/100,00 g water
(anhydrous)(octadecahydrate)
20°C293.15 K <br />68 °F <br />527.67 °R <br />64120
Slightly soluble in ethanol. Insoluble in ethyl acetate and methylamine.


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