Answered Essay: Prelab 1. Define: a. distill and: b. distillate: c. carrier gas: d. retention time Why is a packed

Question number 5 under prelab
10 0, eR turn the heat to 400. Collect the first 3 mL of iae in a 10 mL graduated cylinder and transfer it to a clean, dry 25 mL flask. Label it Fraction 1. Record the temperature as it drips into the graduated cylinder. Collect the next 2- 3 mL of distillate in the graduated cylinder, transfer it to a clean, dry 25 mL flask and label it Fraction 2. Record the temperature as it distills. Check the composition of your samples on the GC, making copies for each partner at the library or taking a photo outside the lab. Include the GC trace with your report. For your results section, use the GC traces of Fraction 1 and Fraction 2 to calculate the grams of ethanol in your samples. Calculate your percent yield of ethanol and compare it to the theoretical yield. Prelab 1. Define: a. distilland; b. distillate; c. carrier gas; d. retention time 2. Why is a packed column used in fractional distillation? 3. What should be circulated through your West condenser to cool vapors to liquid? 4. Is this distillation an open or closed system? What is the difference between the two? 5. In the experiment, what is the approximate temperature range at which the ethanol azeotrope When should you stop collecting distillate? will distill: 25-40 °C; 70-76 °C, 90-100° C? Postlab 1. During the fermentation reaction it was important to prevent air from entering the reaction flask by tying the balloon on firmly with a rubber band. Why? 2. Under aerobic conditions certain bacteria can oxidize ethanol. Oxidation, which is the gain of oxygen or loss of hydrogen, is shown below with benzyl alcohol as an example. Draw the structures of the two analogous compounds that would form if ethanol were oxidized by OH in the same way.

Prelab 1. Define: a. distill and: b. distillate: c. carrier gas: d. retention time Why is a packed column used in fractional distillation? What should be circulated through your West condenser to cool vapors to liquid? Is this distillation an open or closed system? What is the difference between the two? In the experiment, what is the approximate temperature range at which the ethanol azeotrope will distill: 25-40 degree C: 70-76 degree C, 90-100 degree C? When should you stop collecting distillate? Postlab 1. During the fermentation reaction it was important to prevent air from entering the reaction flask by tying the balloon on firmly with a rubber band. Why? 2. Under aerobic conditions certain bacteria can oxidize ethanol. Oxidation, which is the gain of oxygen or loss of hydrogen, is shown below with benzyl alcohol as an example. Draw the structures of the two analogous compounds that would form if ethanol were oxidized by in the same way.

Expert Answer

Answer

Note that an azeotrope is the point in which both species will have the same boiling point mixture, therefore, it will not be possible to separate via simple distillation

If we are using –> water + ethanol mix; this is given approx at the 78°C value

From the ranges shown in the list

choose 70-76°c

We should stop the distillation once we achieve 78°C othrwise, it will evaporate ALL the mix, and we will not be able to achive the max purity.

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