Lab 2 - Suneet Bhansali Experiment 2: Purification of...

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Suneet Bhansali Experiment 2: Purification of Unknown by Recrystallization The purpose of this experiment was to obtain the pure form of an unknown by recrystallization, temperature analysis and different methods of filtration. To dissolve 516.0 mg of an unknown organic acid, 10 mL of hot ethanol was added in a 50 mL Erlenmeyer flask. Ethanol was added in intervals of 1-2 mL while the solution was on a hot plate. Even though 5 mL of ethanol was added, some of it may have evaporated in solution. Ethanol is a good solvent for the unknown acid as long as the solution was hot. Hot ethanol was used instead of cold because only hot ethanol can dissolve the compound (1)*. To ensure the acid and ethanol solution stayed hot, they were kept on a hot plate. After the compound had completely dissolved in ethanol, 5 mL of water was added to the solution to remove the cloudiness. To remove any insoluble substances, a hot filtration could have been done (3). However, it was not required. Next, gravity filtration was used because the
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Lab 2 - Suneet Bhansali Experiment 2: Purification of...

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