Experiment 1- Crystallization.docx

Experiment 1- Crystallization.docx - CHEM 223302 Expt.1...

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CHEM 223302 Expt.1 Pre-lab I. Part 1 (Recrystallization of Pure Phthalic Acid) 1. Set up a hot plate in the fume hood. Hot plate should display: “B” for heating mode and “110 C” for set temp. (*Temperature probe is not needed in this experiment because the water will be heated to the boiling point.) 2. In 25mL or 50mL of Erlenmeyer flask, place 1.0g of phthalic acid. (Phthalic acid is solid in room temperature; solubility of phthalic acid in boiling water is 1g/5.6mL). Then, add 4-5mL of water and a wooden boiling stick to the flask. Prepare 10mL of water in graduated cylinder. Then set the flask on the hot plate. When the water begins to boil in the flask, start adding droplets of water from the graduated cylinder until phthalic acid (solid in room temperature) completely dissolves. If 10mL of water is added and the acid hasn’t completely dissolved, add more water, but at a faster rate. Record the total amount of water that is used to dissolve the acid.
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