DETERMINATION OF "k" KNOWN CONCENTRATIONS Stock concentration of Fe(NO3)3_0.005 M_ Concentration of Fe(NO3)3 in 100mL volumetric flask _0.00015 M Sol. # 1 1.5 x 10-5 M 3.0 x 10-5 4.5 x 10-5 M 6.0 x 10-5 M 7.5 x 10-5 M Calculation of "k" from the excel graph: 2 3 4 Concentration of Fe(NO3)3 in each test tube 5 ABSORBANCE 0.189 0.277 0.323 0.433 0.519 Value of "k