Case A. If the analysis does consume sample volume, then a series of separate sample solutions with added standard need to be prepared. For example, we can take a series of 5 25-mL volumetric flasks, then 1) add 15.0 mL of drinking water to each, 2) add several different aliquots of our Pb standard (53.5 M), and 3) fill each flask to the mark. Complete the following table (Each solution was measured in triplicate and the average absorbance is given): Vo (mL) Vs (mL) V (mL) [S]f (M) Abs (AU) 0.00 0.208 1.00 0.260 2.00 0.309 4.00 0.407 8.00 0.615