1. Below is a graph of three distillations that were performed to separate liqui
ID: 875277 • Letter: 1
Question
1. Below is a graph of three distillations that were performed to separate liquids A and B, with the cumulative volume (x-axis) plotted versus the heat temperature (y- axis). The following 3 types of distillation apparatus were used: simple distillation, fractional distillation with a packed column, fractional distillation with an unpacked column. Distillation of Compounds A and B 180 160 140 120 100 80 Dist 2 60 40 Dist 3 20 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Volume of Liquid Distilled (mL) a. With reference to the graph, which distillation was the most effective in separating the mixture most like an ideal distillation and which of the three possible apparati was used? b. Which distillation was the least effective and what apparatus was used? c. Based on the data on the graph, identify the boiling points for Compounds A and B 2. What is the composition of the vapor in a distillation, over a 1:1 liquid mixture being heated? 3. What was the job of the Rasching rings inside your distillation column? 4. Rashing rings or no, if you heat too quickly, no separation will occur. Why is that? 5. List two changes to your distillation process that would increase your separation results 6. Explain how you assign the identify compounds using the peaks on a GC. 7. a. The gas flow rate affects your separation of peaks during a GC analysis Consider tweaking it a little faster and explain what will result when doing so. b. The oven temperature for the column also affects your sepearation of peaks during a GC analysis. Consider tweaking the oven temperature lower and explain what will occur when doing soExplanation / Answer
1.)
a) Distillation 1 (blue) was the most effective and was done with a fractional packed column. See how temperature is constant while distilling compound A (near 60), once this compound is completly distillated, the temperature raises quickly to distillate compound B.
b) the least effective was the distillation 1 (green), the gradual raise in temperature means both are distilling at the same time.
c) Compount A is around 50-60, compound B is around 170.
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