Study of Transition Temperature Through Mixed Crystal Formation. Part II.

Nuclear Chemistry Division, Saha Institute of Nuclear Physics, 92, Acharya Prafulla Chandra Road, Calcutta-9 Manuscript received 10 November 1970, revised manuscript received 13 December 1971; accepted for publication 9 February 1972 In continuation of our previous work, distribution measurements with cobalt sulphate as host and copper sulphate at tracer concentration as guest at different temperatures were undertaken in an aqueous medium. It has been observed that there is a continuous decrease in partition values with the rise of temperature upto 45.1° where there is a sharp change in partition value and above this temperature no uptake of copper by the host was recorded. Transition temperature of the host component, CoSO4.7H2O has been found by this new method to be 45.1± 0.05°. In view of the sharpness of the inflexion point it has been argued that in favourable circumstances, accurate transition temperature of the host component can be determined by the study of mixed crystal formation in the way proposed