Orgo lab 2 - Andrew Klingsporn Organic Chemistry Lab 2-702 Using Microscale Techniques Purpose To use glassware commonly found in microscale

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Andrew Klingsporn Organic Chemistry Lab 2-702 Using Microscale Techniques Purpose To use glassware commonly found in microscale procedures. Weigh and transfer small amounts of materials. Use air to speed evaporation of volatile solvents. Calculate the percent recovery of benzoic acid dissolved in acetone. Calibrate a micropipette. Calculate the density of cyclohexane. Measure the refractive index of cyclohexane. Identify unknown using physical properties. Procedure Experiment 1: Recovering a solid from a solution 1. Weigh empty vial 2. Add Benzoic acid and reweigh 3. Add Acetone and reweigh 4. Heat mixture in a sand bath while lightly allowing air to pass over the opening until all acetone has evaporated 5. Reweigh vial and solid Experiment 2: Using and calibrating micropipettes 1. Weigh vial 2. Using a micropipette, add 1 mL of deionized water and reweigh. Repeat 3 times Experiment 3: Calculating density of cyclohexane 1. Weigh vial 2. Add 0.5 mL of cyclohexane 3. Reweigh Experiment 4: Measuring refractive index 1. Add a small amount of cyclohexane to the refractometer 2. Adjust and read refractometer Experiment 5: Identifying an unknown
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1. Using above procedures, find the density of the unknown 2. Find the refractive index of the unknown Data Weight (g) Vial 24.6882 Weight of benzoic acid 0.1049 Weight of benzoic and acetone 1.0499 Weight of vial after heating 24.8279 Fig 1. The above data shows the weight before and after heating a solution to determine the ability to recover a solid from a solution. The initial weight of the benzoic acid was 0.1049g. After heating the solution and evaporating the acetone, the
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This note was uploaded on 09/29/2010 for the course CHEM 231 taught by Professor Mat during the Spring '10 term at Northeastern.

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Orgo lab 2 - Andrew Klingsporn Organic Chemistry Lab 2-702 Using Microscale Techniques Purpose To use glassware commonly found in microscale

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