Th e relative acidic strengths ~o f picric acid and t rinitro-m-cresol in benzene have been measured spectrophotometricall y in terms of their reactivi ty with the base, t ribenzylamine. Th e r espective constants found for the combinat ion of tribenzylamine with picric acid and with trinitro-m-cresol in benzene=a t 25° Care 1.58 X 10 3 and 4.48 X 10 2 • The sam e relative order of strengths would be predicted on theoretical grounds. The constant for picric acid is in close agreement wi th previous m ea surements of the dielectric constant of benzene solutions of t ribenzy lammonium picrate. The method used for a ssessm en t of the relat ive strengths of the two 'acids is superior:to m easurem ents of their ionic dissociation in water.
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