Abstract
A plot of negative logarithm of the electrical conductance (K)vs reciprocal of the absolute temperature (T) shows the existence of the transition in the systems ‘Electrolyte-Sucrose-water’, ‘Electrolyte-Mannitol-water’, and ‘Electrolyte-Xylose-water’. A saturated solution of sucrose/mannitol/xylose containing a known amount of an electrolyte was prepared at a temperature of 50·0±0·05° C and the crystals were separated by centrifugation at the same temperature. The conductance of the centrifugate was measured in a tubular conductivity cell at different temperatures in the range between 30° C to 70° C. The plot of −log10 Kvs 1/T showed a break at the saturation temperature, the point where two straight lines appeared to intersect. The transition can be explained on the basis of change in the water structure due to the presence of ‘structure-breaking’ and/or ‘structure-making’ ions. These sucrose, xylose, and mannitol molecules due to the presence of a number of hydrogen bonding sites contribute largely toward the build up of big structures in the supersaturated state. These structures crumble as the system undergoes the transition at the saturation temperature. Different electrolytes produced more or less similar effect.
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Communicated by Professor K. S. G. Doss,f.a.sc.
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Vishnu, Singh, A.K. Transition phenomena at saturation temperature studies on electrolytic conductance of alkali halides in aqueous systems. Proc. Indian Acad. Sci. 80, 57–74 (1974). https://doi.org/10.1007/BF03046682
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DOI: https://doi.org/10.1007/BF03046682