Abstract
The experimental conditions for obtaining periodic crystallization of barium oxalate in silica hydrogel are investigated. The Liesegang rings formed by the reaction of oxalic acid and barium chloride are studied. The dependence of velocity constant and the spacing coefficient on pH, concentrations of inner and outer electrolytes and temperature have also been studied and a possible mechanism for the behaviour is suggested. The deviations from Isemura’s general observations are interpreted by considering the microcrystals constituting the rings and the irreversibility of inner and outer electrolytes.
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Prakash, S.M.D., Rao, P.M. Periodic crystallization of barium oxalate in silica hydrogel. Bull. Mater. Sci. 8, 511–517 (1986). https://doi.org/10.1007/BF02744117
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DOI: https://doi.org/10.1007/BF02744117