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:
- Single-solvent recrystallization
- Multi-solvent recrystallization
- Hot filtration-recrystallization
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.
Due to the impurity of charcoal, naphthalene found to have grayish color.
Want to see more full solutions like this?
Chapter 4 Solutions
EBK MACROSCALE AND MICROSCALE ORGANIC E
- Nonearrow_forwardComment on the following paragraph. In halides, MXn stoichiometry does not require a value of n so large as to prevent the approach of M+ ions, for steric or electrostatic reasons.arrow_forwardExplain Wade's rules, Indicate what the letters S and n represent in the formula.arrow_forward
- Which of the terms explain the relationship between the two compounds? CH2OH Он Он Он Он α-D-galactose anomers enantiomers diastereomers epimers CH2OH ОН O он Он ОН B-D-galactosearrow_forwardHi, I need help on my practice final, If you could offer strategies and dumb it down for me with an explanation on how to solve that would be amazing and beneficial.arrow_forwardHi I need help with my practice final, it would be really helpful to offer strategies on how to solve it, dumb it down, and a detailed explanation on how to approach future similar problems like this. The devil is in the details and this would be extremely helpfularrow_forward
- In alpha-NbI4, Nb4+ should have the d1 configuration (bond with paired electrons: paramagnetic). Please comment.arrow_forwardHi, I need help on my practice final, if you could explain how to solve it offer strategies and dumb it down that would be amazing. Detail helpsarrow_forwardBriefly explain the following paragraph: both the distortion of symmetry and the fact that the solid is diamagnetic indicate the existence of a Nb-Nb bond.arrow_forward
Macroscale and Microscale Organic ExperimentsChemistryISBN:9781305577190Author:Kenneth L. Williamson, Katherine M. MastersPublisher:Brooks Cole
Chemistry: Matter and ChangeChemistryISBN:9780078746376Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl WistromPublisher:Glencoe/McGraw-Hill School Pub Co
Chemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage Learning
Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning