Atomistry » Chromium » Compounds » Chromic Pyrophosphate
Atomistry »
  Chromium »
    Compounds »
      Chromic Pyrophosphate »

Chromic Pyrophosphate, 2Cr2O3.3P2O5

Chromic Pyrophosphate, 2Cr2O3.3P2O5 or Cr4(P2O7)3, is obtained when sodium pyrophosphate is added to a boiling solution of chrome alum, or when fused sodium metaphosphate is saturated with chromium sesquioxide at a high temperature. It yields small, pale green, transparent, rhomboclinic prisms, of density 3.2 at 20° C. It is insoluble in ordinary acids, but will dissolve in water acidified with sulphuric acid, from which solution it is deposited in an amorphous form on boiling; it is soluble in solutions of sodium pyrophosphate in strong mineral acids, and in a solution of caustic potash. It is not altered by ammonium sulphide. On heating to 100° C. its colour deepens, but on ignition it turns a paler green. Double salts with potassium and sodium have been obtained.

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
Home   |    Site Map   |    Copyright   |    Contact us   |    Privacy