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Partition Coefficient Lab Report

808 Words4 Pages

The Partition Coefficient (Kp) Excretion of Benzoic acid and its conjugate Base from Two Immiscible Phases Abstract: The partition coefficient is the ratio of concentrations of compounds in the two phases of a mixture of two immiscible solvents at equilibrium. The purpose of this experiment is to determine the partition coefficient of benzoic acid first in water with methylene chloride, and then in sodium bicarbonate solution with methylene chloride. The partition coefficient result for Part A (water with methylene chloride) was 3, while the result I got for Part B (methylene chloride with sodium bicarbonate solution) was 0.55. Both results correlate to the ideal values which were greater than 1 for part A, and less than 1 for part B. In each of these separations, when the layers were allowed to settle and mixed together, two different …show more content…

Discussion / Conclusion: The purpose of this lab was to calculate the partition coefficients in a mixture of benzoic acid, methylene chloride, and water, as well as a mixture of benzoic acid, methylene chloride, and sodium carbonate solution. While observing the partition coefficients, parts A and B are very different. Molecules having their own solubility levels as well as properties were the result of the different partition coefficients. In this experiment, benzoic acid will end up dissolving differently in each solvent that is added. In part A, I was able to determine that both molecules in the mixed solution have similar degrees of polarity. Methylene chloride and water are both polar, as is benzoic acid, however, both benzoic acid and methylene chloride are only slightly polar. They are very similar in chemical properties because they are just slightly polar. Why benzoic acid is high in mass is explained by the similarity in chemical properties, and the reason the partition coefficient is greater than 1. Mine resulted in a partition coefficient of

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