CHM120H5 Study Guide - Midterm Guide: Benzaldehyde, Aldehyde, Molar Mass

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9 Feb 2016
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Purpose
The purpose of this experiment was to determine the identification of an unknown
compound, solution number 50, by determining its functional group and molar mass.
Experimental Method
The functional group and molar mass of the unknown compound were investigated
according to the procedure given in the lab manual (pages 52-55)1. The molar mass were
calculated according to the same procedure1 and are presented in Appendix I.
Part 1: Identification of the Functional Group
The following tests determined whether the unknown is aldehyde, ketone, primary
alcohol, secondary alcohol, or ester.
1.1 Test for Aldehyde
In this test, Benzaldehyde was used. In the control experiment, a silver mirror was
produced at the bottom of the test tube. This positive result was described in the lab
manual1. See the discussion section for the chemistry of this test.
The unknown was treated similarly. However, the test for the unknown did not
produce any silver mirror, as the unknown remained clear. Therefore, the positive results
from the control vs the negative results from the unknown implied that the unknown is
not an aldehyde.
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1.2 Test for Ketone
In this test acetone was used. In the control experiment, deposits of yellow
crystals were produced. This positive result was expected from the lab manual1. The
chemistry of this is described in the Discussion section.
The unknown was treated similarly. However, the test for the unknown did not
produce any yellow crystals, as the unknown remained clear. Therefore, the positive
results from the control vs. the negative results from the unknown implied that the
unknown is not a ketone.
1.3 Test for Alcohols
In this test, the control experiment used 1-Propanol and 2-Propanol to represent
primary and secondary alcohols, respectively. It was noticed, the solution mixture with 1-
Propanol remained clear throughout the lab period. Whereas, within a few minutes, the
mixture with 2-Propanol yielded a white and cloudy solution. These observations and
results were as expected from the lab manual1. The chemistry of this test is discussed in
the Discussion section.
The unknown was also tested likewise. The solution mixture with the unknown
remained clear, similar to the observations from the control with 1-Propanol. The
negative results from the unknown implied that the unknown is not an alcohol.
1.4 Test for Ethers
The control experiment used ethyl acetate. The odor of ethyl acetate was similar
from that of the unknown. In fact, both solutions were of a clear colour. These
observations suggest that the unknown is an ether.
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