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Qualitative Analysis

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Submitted By monkeysoccer78
Words 470
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Prelab
UNKNOWN
Number 1

Element %

Carbon 67.01744
Hydrogen 7.311602
Nitrogen 7.817121
Oxygen 17.853837

mmass 179.2 g/mol
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Carbon 67.01744% x 179.2 = 120.095 / 12.011 = 9.999 = 10
Hydrogen 7.311602% x 179.2 = 13.102 / 1.008 = 12.998 =13
Nitrogen 7.817121% x 179.2 = 14.008 / 14.008 = 1.004 = 1
Oxygen 17.853837% x 179.2 = 31.994 / 15.999 = 1.999 = 2

C10H13NO2
[pic]---------------------------------------------------------------------------------------------------------------------
Degree of Unsaturation

2C + 2 + N - X - H = 5 2
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Functional Groups

amide, aromatic, ether

Tests

melting point, solubility

Physical Properties

white crystalline powder, odorless

Introduction

Qualitative analysis in organic chemistry is used in the identification of unknown substances. Although there is not a rule of order when performing these tests it is more important to have a systemic approach. If the same general order is always used then the results will be more favorable.
|General Scheme of Analysis |
|A. Preliminary Test |
|Note physical characteristics: solid, liquid, color, and odor. Compounds that are yellow to red in color are often highly conjugated. |
|Amines often have a fish-like odor, while esters usually have a pleasant fruity or floral smell. Acids have a sharp, biting odor. Odors can|
|illicit information about your unknown; it is wise to sniff them with caution. Some compounds can have corrosive vapors or make you feel |
|nauseous. |
|B. Physical Constants |
|Determine the boiling point or melting point. Distillation is recommended in case of liquids. It serves the dual purpose of determining the|
|boiling point as well as purifying the liquid for subsequent tests. |
|C. Solubility Tests |
|The solubility of the unknown in the following reagents provides very useful information. In general, about 1 mL of the solvent is used |
|with approximately 0.1 g or 0.2 mL (2-3 drops) of the unknown compound. Assistance in analyzing the results from your solubility tests can |
|be found in the solubility flowchart given in Fieser and Williamson on page 606. (Careful, this flowchart is much more complex than our lab|
|requires and often can make it more difficult to form conclusions from your solubility data..) |
|D. Group Classification Tests |
|After analysis of the previous tests and the compound's IR spectrum, if needed, further information can be deduced by performing carefully |
|selected functional group classification tests. |

***http://www.wellesley.edu/Chemistry/chem211lab/Orgo_Lab_Manual/Appendix/ClassificationTests/index.html***

[pic] *copied from blackboard*
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[pic] *http://www.hanhonggroup.com/ir/ir_en/B36099.html*

^ ^ ^ ^ ^ ^ N-H C=O C-O

The N-H group in an amide shows strong absorption at 3200-3400.

The C=O group in amide shows strong absorption at 1700.

[pic]

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[pic]

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Results

Melting Point 133 C
Solubility Partially soluble in water

By using the qualitative analysis tests and all of the spectra, it was determined that the unknown was phacetin.

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