Macroscale and Microscale Organic Experiments
Macroscale and Microscale Organic Experiments
7th Edition
ISBN: 9781337329552
Author: Kenneth L. Williamson; Katherine M. Masters
Publisher: Cengage Learning US
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Chapter 4, Problem 11Q
Interpretation Introduction

Interpretation:

The reason to avoid the use of beaker for recrystallization should be determined.

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

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5. Use the MS data to answer the questions on the next page. 14.0 1.4 15.0 8.1 100- MS-IW-5644 26.0 2.8 27.0 6.7 28.0 1.8 29.0 80 4.4 38.0 1.0 39.0 1.5 41.0 1.2 42.0 11.2 43.0 100.0 44.0 4.3 79.0 1.9 80.0 2.6 Relative Intensity 40 81.0 1.9 82.0 2.5 93.0 8.7 20- 95.0 8.2 121.0 2.0 123.0 2.0 136.0 11.8 0 138.0 11.5 20 40 8. 60 a. Br - 0 80 100 120 140 160 180 200 220 m/z Identify the m/z of the base peak and molecular ion. 2 b. Draw structures for each of the following fragments (include electrons and charges): 43.0, 93.0, 95.0, 136.0, and 138.0 m/z. C. Draw a reasonable a-fragmentation mechanism for the fragmentation of the molecular ion to fragment 43.0 m/z. Be sure to include all electrons and formal charges. 6. Using the values provided in Appendix E of your lab manual, calculate the monoisotopic mass for the pyridinium ion (CsH6N) and show your work.
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