Concentration of the Standard Fe Solution in ppm 6. The average concentration of the Second Unknown Dilution in ppm. Use the value given in 7, above, to calculate the original concentration in ppm Fe in the solution given you by your instructor. Pages in your lab notebook containing the pertinent data Attach the original or a copy of the absorption spectrum to the report sheet. Questions on Colorimetric Iron 1.
Tea contains a significant amount of tannic acid.
Given this fact explain why a cup of tea made with distilled water does not show the characteristic dark brown color of tea made with ordinary water. List some characteristics of a good complexing agent for colorimetric analyses. Calculate the ppm Fe in your Stock Fe Solution .