The relationships between the formation fraction and boiling time of monoclinic hydrous-zirconia fine par ticles produced by the hydrolysis of ZrOCl2 solutions with and without an addition of HCl were measured to investigate the effects of added HCl on the formation rate. The chemical kinetics analyses revealed that the formation-rate constant (k) of hydrous-zirconia particles, under a constant ZrOCl2 concentration, decreased with increasing HCl concentration. The decrease in the k-value can be

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... explained by the decrease of the k(I)term in the ionic strength function contained in k. [