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In part 2, the effect of concentration on the absorbance was examined. We prepared five differently concentrated (but, same path length) solutions, and measured the absorbance of them at the ?max(530nm) discovered in part 1; According to the results, higher concentrated solution had higher absorbance value. The extinction coefficient(?) could be calculated from the results determined in part 2 and Beer’s Law; ? = 1.7 x 103. In part 3, the absorbance of the KMnO4 solution of unknown concentration was measured, and using Beer’s law and dilution equation, the initial concentration of the unknown was determined; The concentration of the solution (unknown # : 15) was calculated to be 3...
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