### THE EFFECT OF H-ION CONCENTRATION ON THE VISCOSITY CHANGES IN THORUM PHOSPHATE GEL-FORMING MIXTURES DURING SETTING

The investigation deals with the measurement of changes in viscosity taking place during the setting of thorium phosphate gel-forming mixtures of different pH. It has been found that the rate of change of viscosity with time increases when the pH is reduced up to a certain value ; further reduction in pH causes a decrease Two sets of straight lines are obtained when values of log ($\eta-\eta_o$) are plotted against t, one set corresponding to...
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