Chromium(III) sulfate
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Chromium(III) sulfate usually refers to the inorganic compounds with the formula Cr2(SO4)3.x(H2O), where x can range from 0 to 18. Additionally, ill-defined but commercially important "basic chromium sulfates" are known. These salts are usually either violet or green solids that are soluble in water. It is commonly used in tanning leather.
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Chromium(III) sulfate | |
Other names
Basic chromium sulfate, chromic sulfate | |
Identifiers | |
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3D model (JSmol) |
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ChEBI | |
ChemSpider |
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ECHA InfoCard | 100.030.217 |
EC Number |
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PubChem CID |
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UNII |
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UN number | 2240 3077 |
CompTox Dashboard (EPA) |
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Properties | |
Cr2(SO4)3 • 12H2O | |
Molar mass | 392.16 g/mol 608.363 g/mol (dodecahydrate) 716.45 g/mol (octadecahydrate) |
Appearance | reddish-brown crystals (anhydrous), purple crystals (hydrated) |
Density | 3.10 g/cm3 (anhydrous) 1.86 g/cm3 (pentadecahydrate) 1.709 g/cm3 (octadecahydrate) |
Melting point | 90 °C |
Boiling point | >700 °C (decomposes to chromic acid) |
insoluble (anhydrous) soluble (hydrated) | |
Solubility | soluble in alcohol practically insoluble in acid |
+11,800·10−6 cm3/mol | |
Hazards | |
GHS labelling: | |
Warning | |
H314, H317, H332, H334, H335, H340, H350, H373, H412 | |
P201, P202, P260, P261, P264, P271, P272, P273, P280, P281, P285, P301+P330+P331, P302+P352, P303+P361+P353, P304+P312, P304+P340, P304+P341, P305+P351+P338, P308+P313, P310, P312, P314, P321, P333+P313, P342+P311, P363, P403+P233, P405, P501 | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
NIOSH (US health exposure limits): | |
PEL (Permissible) |
TWA 1 mg/m3[1] |
REL (Recommended) |
TWA 0.5 mg/m3[1] |
IDLH (Immediate danger) |
250 mg/m3[1] |
Safety data sheet (SDS) | MSDS |
Related compounds | |
Other cations |
Aluminium sulfate |
Related double salts |
Chrome alum |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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