Abstract
The present paper deals with the study of the changes in conductance of thorium chloride with progressive addition of sodium hydroxide solution. It has been observed that the conductance of the mixture decreases and reaches a minimum and then finally rises. For concentrated solutions, the minimum point is much less than at the ratio Th4+∶ 0H−∶∶ 1∶4. As the solutions used are diluted, the minimum point shifts towards the theoretical equivalent amount. Similar results are also observed in reverse titrations. In this paper it has been supported that the precipitation is accompanied by the adsorption of various ions from the system, which in its turn completes the precipitation much before the theoretical equivalent of alkali as shown by the minima points of the curves.
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