Laboratory Techniques in Organic Chemistry
4th Edition
ISBN: 9781464134227
Author: Jerry R. Mohrig, David Alberg, Gretchen Hofmeister, Paul F. Schatz, Christina Noring Hammond
Publisher: W. H. Freeman
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Chapter 7, Problem 1Q
Interpretation Introduction
Interpretation:
The reason to connect water to a condenser so it flows in at bottom and out at top should be determined.
Concept introduction:
Many organic reactions are non-spontaneous and to proceed they require heat. The heating of reagents mixture in open containers causes evaporation of the compounds while heating in the close container can cause an explosion.
Expert Solution & Answer
Explanation of Solution
The condenser is an apparatus that is used in the laboratory to cool the heated liquid. It is vertically mounted above reaction flask and provides a method to cool vapor so that it condenses and flows back in reaction flask.
The condenser is cooled by water or air. Therefore, water is connected to condenser so it can be ensured that there are no air bubbles and can efficiently cool the glass wall of the condenser.
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Why is cold water circulated through the condenser from the bottom rather than from the top?
Why is it preferable to allow cold water to enter at the bottom of a condenser and exit at the top rather than vice versa?
Use vapor pressure.
A student leaving campus for spring break wants to make sure the air in his dorm room has a high water vapor pressure so that his plants are
comfortable. The dorm room measures 3.01 m x 4.12 m x 3.48 m and the student places a pan containing 0.566L of water in the room.
Assume that the room is airtight, that there is no water vapor in the air when he closes the door, and that the temperature remains a constant
21 °C.The vapor pressure of water at 21 °C is 18.7 mm Hg.
(a) Calculate the pressure that the water vapor would exert if all of the liquid water evaporated.
mm Hg
(b) Will all of the water in the pan evaporate?
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Chapter 7 Solutions
Laboratory Techniques in Organic Chemistry
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