1. The problem statement, all variables and given/known data A 0.120 M solution of sodium picrate ina 1 M sodium hydroxide solution was observed to have an absorbance of 0.335, due only to the absorption by the picrate anion. In the same spectrophotometer cell and at the same wavelength as in the previous measurement, a 0.300 M solution of picric acid was found to have an absorbance of 0.581. Calculate the dissociation constant for picric acid 2. Relevant equations A=abc Ka = [A]/[AB] 3. The attempt at a solution I am not sure where to begin but this is what I thought so far: 0.335 = 0.120 a a=2.792 0.581 = .300 a a = 1.937 I am not sure how to use the absorption values in the dissociation constant equation.