![]() ![]() The Jones oxidation, which uses a solution of potassium dichromate or sodium dichromate acidified with sulfuric acid to oxidize alcohols, produces chromium(III) sulfate as a byproduct, along with sodium or potassium sulfate. ![]() Its use as a tanning chemical has largely been superseded by chrome alum and other agents. ![]() Purer samples can be dried to form a lighter-colored powder.Ĭhromium(III) sulfate is readily soluble in water and some lower alcohols.Ĭhromium sulfate, for the most part, can only be purchased from online suppliers. Recently prepared samples or those that have been subjected to heat may contain a deep green-colored sulfato complex and are hygroscopic as a result. Strong oxidizers such as hypochlorite can oxidise the aqueous Cr(III) to chromate (CrO 4 2-).Ĭhromium(III) sulfate most often appears as a blue-grey or violet-grey amorphous solid. If the base used is a carbonate or bicarbonate, this reaction is accompanied with the release of carbon dioxide, in a manner similar to iron, which does not form carbonates. Treatment of chromium(III) sulfate with bases produces chromium(III) hydroxide. Freshly prepared chromium sulfate often contains traces of this coloration, with some samples even appearing green rather than blue, but is otherwise usable.Ī solution of both chromium(III) sulfate and potassium sulfate will yield crystals of chrome alum on partial evaporation. Solutions of chromium(III) sulfate turn from blue to green upon heating, indicating the formation of a less reactive "sulfato-complex" that may take days or weeks to revert. ![]()
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