MACROSCALE+MICRO.ORG...-OWLV2 ACCESS
MACROSCALE+MICRO.ORG...-OWLV2 ACCESS
7th Edition
ISBN: 9781305884175
Author: Williamson
Publisher: CENGAGE L
Question
Book Icon
Chapter 4, Problem 1Q
Interpretation Introduction

Interpretation:

The gray color of the naphthalene obtained after the usual purification procedure should be explained.

Concept introduction:

Recrystallization is a technique that is used to purify the impure compounds. It is based on the principle that the solubility of substances increases with the increase in temperature.

Following are some of the types of recrystallization:

  1. Single-solvent recrystallization
  2. Multi-solvent recrystallization
  3. Hot filtration-recrystallization

Expert Solution & Answer
Check Mark

Answer to Problem 1Q

The gray color of naphthalene is due to the impurity of charcoal.

Explanation of Solution

The change in color of naphthalene indicates the presence of an impurity in it. But this impurity neither lowers the melting point of the sample nor widens the melting point range. So this is not a normal small-sized impurity and it shows only color change in the sample. The color of the sample changes from white to gray so the impurity may be charcoal (black) that is used in the recrystallization process.

Conclusion

Due to the impurity of charcoal, naphthalene found to have grayish color.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
Students have asked these similar questions
Predict the major organic product(s) of the following reactions. Indicate which of the following mechanisms is in operation: SN1, SN2, E1, or E2.
(c) (4pts) Mechanism: heat (E1) CH3OH + 1.5pts each _E1 _ (1pt) Br CH3OH (d) (4pts) Mechanism: SN1 (1pt) (e) (3pts) 1111 I H 10 Ill!! H LDA THF (solvent) Mechanism: E2 (1pt) NC (f) Bri!!!!! CH3 NaCN (3pts) acetone Mechanism: SN2 (1pt) (SN1) -OCH3 OCH3 1.5pts each 2pts for either product 1pt if incorrect stereochemistry H Br (g) “,、 (3pts) H CH3OH +21 Mechanism: SN2 (1pt) H CH3 2pts 1pt if incorrect stereochemistry H 2pts 1pt if incorrect stereochemistry
A mixture of butyl acrylate and 4'-chloropropiophenone has been taken for proton NMR analysis. Based on this proton NMR, determine the relative percentage of each compound in the mixture
Knowledge Booster
Background pattern image
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
Macroscale and Microscale Organic Experiments
Chemistry
ISBN:9781305577190
Author:Kenneth L. Williamson, Katherine M. Masters
Publisher:Brooks Cole
Text book image
Chemistry: Matter and Change
Chemistry
ISBN:9780078746376
Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Publisher:Glencoe/McGraw-Hill School Pub Co
Text book image
Chemistry: Principles and Reactions
Chemistry
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:Cengage Learning
Text book image
Organic Chemistry
Chemistry
ISBN:9781305580350
Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote
Publisher:Cengage Learning