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Chromium(III) sulfate | |
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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: | |
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
Temperature | g/100,00 g water | |
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(anhydrous) | (octadecahydrate) | |
20°C293.15 K <br />68 °F <br />527.67 °R <br /> | 64 | 120 |
Gallery
Sources
Chromium compounds | |
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Salts |
Chromates • Chromium(II) acetate (Cr(CH3COO)2) • Chromium(III) sulfate (Cr2(SO4)3) • Chromium(II)-ammonium sulfate ((NH4)2Cr(SO4)2) • Chromium(III)-ammonium sulfate (NH4Cr(SO4)2) • Chromium(III)-potassium sulfate (KCr(SO4)2) |
Complexes |