Chrome alum
Chemical compound / From Wikipedia, the free encyclopedia
Chrome alum or Chromium(III) potassium sulfate is the potassium double sulfate of chromium. Its chemical formula is KCr(SO4)2 and it is commonly found in its dodecahydrate form as KCr(SO4)2·12(H2O). It is used in leather tanning.[1]
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ChemSpider | |
ECHA InfoCard | 100.030.352 |
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MeSH | chrome+alum |
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CompTox Dashboard (EPA) |
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Properties | |
KCr(SO4)2 | |
Molar mass | 283.220 g/mol |
Appearance | dark purple needles or greyish-brown powder when anhydrous |
Density | 1.83 g cm−3 |
Melting point | 89 °C (192 °F; 362 K) |
Boiling point | 400 °C (752 °F; 673 K) |
24 g/100mL (at 20 °C) | |
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H315, H319 | |
P305+P351+P338 | |
Structure | |
cubic | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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