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Q2. For the UV-Vis absorption data below, calculate the concentration for the metals M2+ and N2+ in a river sample if the unknown solution was prepared by diluting 10.00 mL of river water with 10.00 mL of ligand solution and diluted to a final volume of 100.00 mL. Assume the absorbance was measured in a 1.00-cm cell. Solution M2+ standard N2 standard M2+ standard N2+ standard Unknown Unknown Wavelength Concentration Absorbance 650 nm 1.82E-05 0.723 650 nm 1.82E-05 0.312 425 nm 1.82E-05 0.199 425 nm 1.82E-05 0.811 650 nm ? 0.753 425 nm ? 0.536