Colloid-Chemical Behaviour of the Reaction Products of Pyrophosphoric Acid with Copper (II), Cobalt(II), Nickel(II) and Vanadyl(II)

Department of Chemistry, University of Roorkee, Roorkee

Manuscript received 24 June 1975 ; accepted 14 August 1975

The qualitative measure of the polymerisation effect on the complexes of Cu(II), Co(ll), Ni(II), VO(II) with H₄P₂O₇ effect was studied by conductometric studies. To measure this effect quantitatively, colloidal studies were performed. In this connection, changes of r-potential on addition of the electrolyte as well as non electrolytes, the change or pH on their addition were measured. From these studies it was concluded that all of them form the polymerised product of the type \([M(H_2P_2O_7)]_x^{2x}\) where x corresponds to [M(H₂P₂O₇)₂]^2-.