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 7Q
In fractional distillation, liquid can be seen running from the bottom of the distillation column back into the distilling flask. What effect does this returning condensate have on the fractional distillation?
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A 10.00 mL sample of ethanol is added to 250.0 mL of water in order to observe the freezing point depression of the water. Consider the possible errors in this experiment, and determine whether each would cause the freezing point of the water to increase, decrease, or remain the same compared with the expected results.
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1. Which is more efficient for separating the components of a liquid mixture of a liquid mixture, simple or fractional distillation? Why?
2. Explain (in 1 – 3 sentences) how distillation works in separating simple mixtures.
A chemistry student adds a quantity of an unknown solid compound X to 550. mL of distilled water at 30.° C. After 10 minutes of stirring, all of the Xhas
dissolved. The student then drains off the solution and evaporates the water under vacuum. A precipitate is left behind. The student washes, dries and weighs
the precipitate. It weighs 19.3 g.
O yes
Using only the information above, can you calculate
the solubility of X in water at 30.° C?
O no
If you said yes, calculate it.
Be sure your answer has a unit symbol and the right
number of significant digits.
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Macroscale and Microscale Organic Experiments
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Solutions: Crash Course Chemistry #27; Author: Crash Course;https://www.youtube.com/watch?v=9h2f1Bjr0p4;License: Standard YouTube License, CC-BY