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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/093/05/0801-0811

    • Keywords

       

      Spacing law; cobalt(II) oxinate; silver iodide; lead chromate; revert and direct Liesegang rings; preferential adsorption theory

    • Abstract

       

      The spacing laws of Jablczynski and Mathur are applied to the Liesegang rings of cobalt(II) oxinate, silver iodide and lead chromate in agar gel. Although Jablczynski’s spacing law satisfactorily explains the direct Liesegang rings, it totally fails to describe the revert Liesegang rings. Similary though Mathur’s spacing law is applicable to both revert and direct types of periodic precipitation, an appreciable deviation is observed in systems with greater interspacing. A new spacing law, applicable to both revert and direct Liesegang rings, is proposed on the basis of the preferential adsorption theory of Liesegang rings. It is experimentally verified with silver iodide and lead chromate systems.

    • Author Affiliations

       

      N Kanniah1 F D Gnanam1 P Ramasamy1

      1. Crystal Growth Centre, Anna University, Madras - 600 025, India
    • Dates

       
  • Journal of Chemical Sciences | News

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