Question

3. Here is an output of the Vandeemter Equation for a 15 meter long column (10 marks total) 0.006 H-A+B/u +Cu 0.004 Cu 의 0.002 B/u 0.000 0.2 0.6 0.8 0.4 Linear velocity, u (cm/s) 0.0 CHEM 2400H_FA 2017 Page 2 of 3 Answer the following questions a) In your own words describe what each variable H, A, B, and C mean in the figure (2 marks) b) Based on this figure, define the optimal conditions for the column (Hint: express both the optimum linear velocity and plate height in this condition) (2 marks) c) If you change the linear velocity from the optimum condition to 0.05 cm/s what would happen to the column's efficiency? (2 marks) What is the number of theoretical plates for this column at this linear velocity? (2 marks) d) Using your calculated value for N in part (c), how does this column compare to a competitor's column of the same length that produces a plate number of 425 000? (1 mark) If both were the same price to buy, which column would you invest in? (1 mark)

          3. Here is an output of the Vandeemter Equation for a 15 meter long column (10 marks total) 0.006 H-A+B/u +Cu 0.004 Cu 의 0.002 B/u 0.000 0.2 0.6 0.8 0.4 Linear velocity, u (cm/s) 0.0 CHEM 2400H_FA 2017 Page 2 of 3 Answer the following questions a) In your own words describe what each variable H, A, B, and C mean in the figure (2 marks) b) Based on this figure, define the optimal conditions for the column (Hint: express both the optimum linear velocity and plate height in this condition) (2 marks) c) If you change the linear velocity from the optimum condition to 0.05 cm/s what would happen to the column's efficiency? (2 marks) What is the number of theoretical plates for this column at this linear velocity? (2 marks) d) Using your calculated value for N in part (c), how does this column compare to a competitor's column of the same length that produces a plate number of 425 000? (1 mark) If both were the same price to buy, which column would you invest in? (1 mark)

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