Abstract
The physical form of a precipitate is subject to considerable random variation but is determined largely by the first batch of precipitated particles. So turbidimetric titration procedures are generally preferable to turbidimetric determinations based upon comparisons to standards. Titration curves of optical density vs. volume of titrant have been calculated for various conditions of nucleation and crystal growth. It is predicted from the calculated curves that any factor which enhances nucleation at the expense of crystal growth should improve the analytical usefulness of turbidimetric titrations. One such factor is the presence of a non-ionic surfactant which is apparently adsorbed on crystal surfaces, thereby minimizing further crystal growth. The prediction is verified with some precipitation reactions, but the surfactant is of no effect on others.
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