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 7VD8
Zn in 7V1R
Zn in 7V1Q
Zn in 7VPF
Zn in 7T85
Zn in 7T5F
Zn in 7NF9
Zn in 7M4M
Zn in 7M4O
Zn in 7M4N
© Copyright 2008-2020 by atomistry.com
Home   |    Site Map   |    Copyright   |    Contact us   |    Privacy