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2. Chromium(III) sulfate - Wikipedia

   en.wikipedia.org/wiki/Chromium(III)_sulfate

   Hydrated chromium(III) sulfate, Cr 2 (SO 4) 3 ·18H 2 O, (CAS #13520-66-6) is a violet solid that readily dissolves in water to give the metal aquo complex, [Cr(H 2 O) 6] 3+. The formula of this compound can be written more descriptively as [Cr(H 2 O) 6 ] 2 (SO 4 ) 3 ·6H 2 O. Six of the eighteen water molecules in this formula unit are water ...

3. Tanning (leather) - Wikipedia

   en.wikipedia.org/wiki/Tanning_(leather)

   Chromium(III) sulfate ([Cr(H 2 O) 6] 2 (SO 4) 3) has long been regarded as the most efficient and effective tanning agent. [ 12 ] [ 13 ] Chromium(III) compounds of the sort used in tanning are significantly less toxic than hexavalent chromium , although the latter arises in inadequate waste treatment.

4. Chromium(II) sulfate - Wikipedia

   en.wikipedia.org/wiki/Chromium(II)_sulfate

   Chromium(II) sulfate is an inorganic compound with the chemical formula Cr S O 4. It often comes as hydrates CrSO 4 ·nH 2 O. Several hydrated salts are known. The pentahydrate CrSO 4 ·5H 2 O is a blue solid that dissolves readily in water. Solutions of chromium(II) are easily oxidized by air to Cr(III) species.

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7. Chrome alum - Wikipedia

   en.wikipedia.org/wiki/Chrome_alum

   Chrome alum or Chromium(III) potassium sulfate is the potassium double sulfate of chromium. Its chemical formula is KCr(SO 4 ) 2 and it is commonly found in its dodecahydrate form as KCr(SO 4 ) 2 ·12(H 2 O).

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