From the absorbance at 460nm, calculate [I-] directly, by using Equation (3). Then multiply this concentration by the original volume (0.010L) to calculate the number of moles of I- at equilibrium in each test tube. Subtract this number from the total number of I- added initially to obtain the number of moles of I- in the precipitate.
absorbance of test tube 1: 0.632
test tube 2: 0.768
test tube 3: 0.840
test tube 4: 1.045
equation 3:
