Macroscale and Microscale Organic Experiments
Macroscale and Microscale Organic Experiments
7th Edition
ISBN: 9781305577190
Author: Kenneth L. Williamson, Katherine M. Masters
Publisher: Brooks Cole
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Chapter 5, Problem 4Q
Interpretation Introduction

Interpretation:

The conclusion about the homogeneity of the distillate in the fractional distillation of ethanol-water mixture should be determined. Also, whether the mixture has a constant boiling point or not and is pure compound or not is to be determined.

Concept introduction:

The fractional distillation is a technique that is used to separate various components or fractions from a mixture on the basis of their volatilities. The fractional distillation can be used if the boiling point difference between the components is less than 75°C. Fractional distillation is better than the simple distillation due to the low boiling point range. It is used to separate useful substances from crude oil in oil refineries.

A mixture with uniform composition and properties throughout is called homogenous mixture.

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1. What characteristics must a substance possess for it to be separated from a heterogeneous mixture by steam distillation? 2. Explain the role of steam in facilitating the distillation of essential oils. 3. Compare and contrast simple and steam distillation in terms of the type of mixtures separated by each technique. 4. What is/are the difference(s) between a simple distillation and steam distillation?
Explain the importance of using a thermometer in the simple distillation setup. Enumerate the characteristics of a substance for it to be separated from the heterogeneous mixture by steam distillation. How does steam facilitate the distillation of essential oils? Discuss some applications of simple distillation and steam distillation. Explain why you can use each method for the chosen application. What is the most dominant intermolecular forces of attraction that exist between: a. water and limonene, the major monoterpene component of lemon essential oil? b. water and constituent ions of sodium chloride? 6. Based on your answers in number 5, which pair (water-limonene or water-sodium chloride) exhibits a stronger attraction between their molecules/ions? 7. Describe what happens during the salting-out process in terms of the intermolecular forces of attraction involved as mentioned in your previous answers.
Compare the simple distillation of pure hexane and binary mixture of hexane and toluene to that of a fractional distillation?
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