Plot the calibration curve of absorbance versus molar concentration for the standard solutions. Calculate the absorptivity coefficient for the metal ion. Data Analysis, F, G Have the instructor approve your graph D. Unknown Metal Ion Concentration 1. Prepare the unknown. Describe the preparation for the solution containing the unknown concentration of the metal ion. Volume of unknown sample solution (mL) Volume of diluted sample (mL) Concentration of metal ion. Absorbance of metal ion in solution Concentration of metal ion from the calibration curve (mol/L) Concentration of metal ion in the original sample corrected for dilution (mol/L) Show your calculations to account for the dilution of the original sample. 2. 3. Expressing Concentration. Express the concentration of the metal ion in the sample in appropriate units volume [i.e., pph (percent), ppm, ppb, etc.]. Concentration of metal ion in the original sample (mass/volume) Show calculations.