To obtain the equation of the best fit line and the value of the concentration of Fe³⁺ in the water sample, do a regression analysis using Microsoft Excel. You must also demonstrate how to use the graph to determine the unknown concentration.

I know the concentrations for the table is 0,2.50,5.00,7.50 and 10.00 on that order.

Ten (10) mL aliquots of a natural water sample containing the analyte Fe3+ were pipetted into a 100mL volumetric flask. Exactly 0.00mL,5.00mL,10.00mL,15.00mL and 20mL of a Standard Solution containing 50ppmFe3+ were added to each. After dilution to the mark, the absorbance of each of the five solutions were measured. Complete the following table by calculating the concentrations of the standard solutions