Atomistry » Chromium » Compounds » Ammonium Chromium Alum
Atomistry »
  Chromium »
    Compounds »
      Ammonium Chromium Alum »

Ammonium Chromium Alum, (NH4)2SO4.Cr2(SO4)3

Ammonium Chromium Alum, (NH4)2SO4.Cr2(SO4)3.24H2O, crystallises from a suitable mixture of solutions of its component salts in efflorescent octahedra of density 1.73, melting at 100° C. with loss of 18H2O.

Ammonium chromium alum is soluble in water to the extent, at 25° C., of 21.21 grams of the hydrated salt in 100 c.c. of water, yielding a bluish-violet solution which becomes green at 70° to 80° C. A study of the equilibria existing in such a solution makes it appear that the change from the violet to the green modification does not take place at all at 0° C., but that at 40° C. the solution contains about 40 per cent, of the green alum.

Last articles

Zn in 7OQY
Zn in 7PEL
Zn in 7OYG
Zn in 7P3S
Zn in 7PE7
Zn in 7RZC
Zn in 7PE9
Zn in 7PE8
Zn in 7RAG
Zn in 7RN5
© Copyright 2008-2020 by atomistry.com
Home   |    Site Map   |    Copyright   |    Contact us   |    Privacy