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Abstract
A new indicator, 2,7-bis(o-sulfophenylazo)-1,8-dihydroxynaphthalene-3, 6-disulfonic acid (sulfonazo-III), was successfully used for the direct titration of negative colloid solutions with polydiallyldimethylammonium chloride (Cat-Floc) at a pH range from 3 to 10. The end-point is indicated by a color change from blue to violet. Some of the colloid titration results (meq g−1 against pH) are given for polycations and polyanions. This method is applied to the study of the formation of polyion complexes (PIC). The PIC was found to consist of equimolar amounts of polycation and polyanion according to colloid titration methods and have no positive and no negative charges over a wide pH range.
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