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Vinyltoluene-styrene copolymer sulfonic acids in dilute solution exhibit conductance behavior which differs appreciably from that of strong 1:1 electrolytes and other chain polyelectrolytes. The equivalent conductance of the polysulfonic acid shows no observable dependence on either polymer concentration or total solution ionic strength at moderate to very high dilutions. However, sodium poly-p-etyrenesulfonate shows a variation of equivalent conductance with concentration which is functionally identical to behavior observed by other workers for sodium polymethacrylate and poly-4-vinyl-N-n-butylpyridinium bromide. Proton counterions are apparently the major contributors to polysulfonic acid solution conductance, which does not vary greatly with polymer molecular weight. Values of ionic dissociation in methanol-water systems were calculated under the assumption of negligible polysulfonate ion mobility. In the regions 0-60% and 90-100% methanol the dissociation is apparently proportional to the solvent dielectric constant. Elsewhere, the dissociation of the polyacid is not significantly influenced by the methanol content of the solvent.

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