Ethical: There were no ethical concerns as no living organisms were used. The concentration of salicylic acid for all the solutions in Table can be seen in the table below. The following graph was plotted based on the absorption values and the concentrations of salicylic acid calculated. The A-intercept of the linear regression was set to zero as a solution with no salicylic acid would have an absorbance of 0. The calculation for determining the molar extinction coefficient, ε, based on the equation of the linear regression in Figure , which shows that the slope of the line is 1211.9, can be seen below. The length of the light path of the cuvettes was considered to be from one inside edge of each cuvette to the other, which was measured to be 1.00cm±0.05 with a ruler.