Journal of Radioanalytical Chemistry

, Volume 26, Issue 2, pp 289–292 | Cite as

Radiometric studies on the reaction of some metals with potassium pentacyanonitrosyl manganate

  • W. U. Malik
  • R. Bembi
  • B. B. Verma


The nature and composition of complexes formed by the reaction of Fe(III), Cr(III), Zn(II), and Co(II) with potassium pentacyanonitrosyl manganate K3 [Mn(CN)5NO] has been investigated by radiometric method. The metals form 1∶1 complexes with K3 [Mn(CN)5NO], the optimum pH for maximum precipitation being 3.6 for Fe(III), 7.3 for Cr(III), 5.4 for Zn(II), and 8.3 for Co(II). The solubility of the complexes as computed from activity at maximum precipitation point follows the order: chromium complex > iron complex > cobalt complex > zinc complex. The radiometric titration curves also show the formation of colloidal precipitates with dilute Zn(II) solutions.


Ferrocyanide Iron Complex Equivalence Point Colloidal Dispersion Maximum Precipitation 
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Copyright information

© Akadémiai Kiadó 1975

Authors and Affiliations

  • W. U. Malik
    • 1
  • R. Bembi
    • 1
  • B. B. Verma
    • 1
  1. 1.Department of ChemistryUniversity of RoorkeeRoorkeeIndia

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