Studies on Liesegang rings of copper molybdate in agar gel medium

Abstract

The present work deals with the studies on Liesegang ring formation of copper molybdate ions using copper sulphate as an outer electrolyte and sodium molybdate as an inner electrolyte. For this purpose 1% agar gel was used and the inner electrolyte concentration was chosen to be 0.025M and 0.05M. While outer electrolyte concentration was kept 0.5M and 0.25M. Morphological characteristics of Liesegang rings such as size of the ring, number of rings per day, and spacing between rings were studied. The concentration of reacting ions in the ring was estimated by atomic absorption spectrophotometer. The obtained results are quantitatively explained on the basis of spacing law, time law and width law. All basic laws were obeyed successfully by the system. It was observed that, the morphological characteristics of the rings were affected by the concentrations of inner and outer electrolytes.