2776 GLENN S. SKINNER AND JOHN B. BICK~ NC Vol. 76 nated to unprotonated base for the fuchsones and isofluorenones in mixtures of concentrated sulfuric and formic acids with ratios for standard indicators in the same solvents. The indicators were p- nitrodiphenylamine, pK,-2.5,* l324 used as reference€ or 2-diphenylmethylene-l-naphthone, and 2, 4-dichloro-6-nitroaniline, pKa-3.3, used for the other unknowns. 2, 4-Dichloro-6- ...
