Assess the following statements about fractional distillation. Determine which are TRUE/FALSE 1.Multiple vaporization-condensation cycles are needed to purify samples of relatively close boiling points 2. The column efficiency of a fractionating column can be assessed by the HETP 3. A fractionating column is part of the apparatus set-up 4. With every condensation-vaporization cycle, the vapors become enriched in the higher boiling point component

Assess the following statements about fractional distillation. Determine which are TRUE/FALSE 1.Multiple vaporization-condensation cycles are needed to purify samples of relatively close boiling points 2. The column efficiency of a fractionating column can be assessed by the HETP 3. A fractionating column is part of the apparatus set-up 4. With every condensation-vaporization cycle, the vapors become enriched in the higher boiling point component

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter5: Distillation

Section: Chapter Questions

Problem 7Q: In fractional distillation, liquid can be seen running from the bottom of the distillation column...

See similar textbooks

Similar questions

The blue line on the diagram illustrates the effect of using fractional distillation to separate a mixture of hexane (C6H14) and heptane (C7H16). If one starts a fractional distillation with a 0.20 mole fraction of hexane, what is the approximate mole fraction of hexane in the vapor phase after two evaporation condensation cycles? Figure B A temperaturecomposition diagram for hexane (C6H14)-heptane (C7H16) mixtures.
Distillation Curve 110 100 90 80 70 60 50 40 40 60 80 100 120 Volume (drops) 14. Based from the fractional distillation curve, what is the ratio of the pure higher-boiling component to the pure lower-boiling component? 2:3 O 2:1 O 1:1 1:2 20 Temp (°C)
Why is it important to perform a fractional distillation slowly? What happens if a fractional distillation is done very quickly by rapidly raising the temperature of the heat source?
Use an apparatus similar to that shown and assume that the round-bottom flask holds 10 mL and that the Claisen head has an internal volume of about 2 mL in the vertical section. At the end of a distillation, vapor would fill this volume, but it could not be forced through the system. No liquid would remain in the distillation flask. Assuming this holdup volume of 12 mL, use the ideal gas law and assume a boiling point of 100°C (760 mm Hg) to calculate the number of microliters of liquid (d = 0.9 g/mL, MW = 200) that would recondense into the distillation flask on cooling.
The distillation flask is best completely filled with mixture as large as available never less than half empty about 70% full
List and describe two methods that can used to improve the separation of a liquid mixture by fractional distillation
Based on the melting point of your impure solid, you look at the given samples and believe you havecompound A. Compound A is recrystallized using a mixed solvent system of ethanol and water. You add1 ml of hot ethanol to your sample and it doesn’t completely dissolve. You continue to add hot ethanolbut there isn’t any change. Some solid remains. What should you do next?
1a. Use the given table to construct a temperature-composition diagram for cyclohexane Toluene mixture. Based on the plot, what is the composition of the distillate obtained by Simple distillation 20 mole percent cyclohexene and 80 mole percent toluene? Show your Work on the plot. 1b. Estimate the composition of the distillate of 20 mole percent of cyclohexane if the Distillation column had three theoretical plates.
Use a temperature-composition diagram to explain why fractional distillation of two components is more easily accomplished if the components have boiling points that differ by 20C or more.
need help with #12
12. Which of the following is TRUE about thè distillation process? None of the above The cold water must enter the upper end of the condenser and exit at the lower end. Better separation is achieved by a fast distillation rather than a slow distillation. O The distilling flask should be filled to more than two-thirds its capacity.
Simple Distillation The temperature was 76o C when the first drop of distillate was collected. Liquid was collected and the temperature gradually rose to 124 o C. Fraction 2 was taken when liquid was distilling at 124o C. Fractional Distillation The temperature was 77o C when the first drop of distillate was collected. Liquid was collected until the temperature reached 78 o C, then the temperature dropped. The temperature of the hot plate was increased and a second fraction of liquid was collected at 126 o C. a.) Based on the boiling points observed when the fractions were collected, what is the identity of the unknown compound isolated in fraction 1 and Fraction 2?