Laboratory Techniques in Organic Chemistry
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 11, Problem 2Q
Interpretation Introduction

(a)

Interpretation:

The disadvantages of the use of too little drying agent should be determined.

Concept introduction:

Drying agents are used to remove water from organic solvents. Mostly anhydrous drying agents are used that react with water to form insoluble hydrates in organic solvents and can be easily removed by filtration. Parameters that are considered to choose an effective drying agent are as follows:

  • Capacity: The maximum number of moles of water molecules that can be trapped by a salt or drying agent defines its capacity.
  • Efficiency: The amount of water left behind in the organic solvent after the drying process is called efficiency.
  • Speed of removal of water: Time taken by the drying agent to form hydrate determines the speed of removal of water.
  • Chemical inertness: Drying agents should be chemically inert that is it should not react with the organic solvent and the organic compounds dissolved in it.

Interpretation Introduction

(b)

Interpretation:

The disadvantages of the use of too much drying agent should be determined.

Concept introduction:

Drying agents are used to remove water from organic solvents. Mostly anhydrous drying agents are used that react with water to form insoluble hydrates in organic solvents and can be easily removed by filtration. Parameters that are considered to choose an effective drying agent are as follows:

  • Capacity: The maximum number of moles of water molecules that can be trapped by a salt or drying agent defines its capacity.
  • Efficiency: The amount of water left behind in the organic solvent after the drying process is called efficiency.
  • Speed of removal of water: Time taken by the drying agent to form hydrate determines the speed of removal of water.
  • Chemical inertness: Drying agents should be chemically inert that is it should not react with the organic solvent and the organic compounds dissolved in it.

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The chemical which reacts with  HCHO to produce a harmless material called urotropin is ___. This can be used to neutralize a large spill of HCHO.     cavity fluid     ammonia     paraformaldehyde     bleach
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Give another example of a drying agent like anhydrous magnesium sulfate.

Chapter 11 Solutions

Laboratory Techniques in Organic Chemistry

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