Micelle formation in concentrated sulfuric acid solutions by long-chain fatty acids (which form cationic bisulfates) was studied by means of surface tension and light scattering measurements. It was found that micelle formation in 95% sulfuric acid took place at a higher concentration than in water, that 5 M potassium bisulfate had a small or negligible effect, and that water (presumably present as hydronium bisulfate) had a very marked effect, lowering the c.m.c.
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