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Effect of Ionic Strength on Equilibrium ConstantsThe use of a pre-programmed or programmable pocket calculator in the laboratory In the measurement of the acid dissociation constant of a weak acid, it is mandatory to include a rigorous treatment of the activity concept. Quite often this important aspect of equilibrium theory is omitted from the laboratory work owing to limitations in laboratory time and computational facilities that are available to students in the laboratory. One method of overcoming the difficulty caused by a limitation in the number of available laboratory hours was described in this Journal (1) more than a decade ago. The experiment involved the determination of the acid dissociation constant of bromcresol green by a spectrophotometric method. Each student made his measurements at a specified ionic strength and the collective data set obtained by the whole class was used to ascertain the effect of ionic strength on the acid dissociation constant.