4000 Wavenumbers (cm-1) 3500 3000 2500 2000 1500 1000 45- 50 55- 783.94 756.10 1481.51 1463.64 1441.15 690.62 60- 1652.36 657.64 65- 1291.06 1323 88 1243.14 1208.04 1609.36 1152.66 886.99 70- 75- 1578.64 1030.47 1089.40 1382.95 852.31 964.44 567.76 80- 2837.85 3231.03 2999.63 2591.76 85
4000 Wavenumbers (cm-1) 3500 3000 2500 2000 1500 1000 45- 50 55- 783.94 756.10 1481.51 1463.64 1441.15 690.62 60- 1652.36 657.64 65- 1291.06 1323 88 1243.14 1208.04 1609.36 1152.66 886.99 70- 75- 1578.64 1030.47 1089.40 1382.95 852.31 964.44 567.76 80- 2837.85 3231.03 2999.63 2591.76 85
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question
Please label the important peaks in this IR for saponification experiment: identify the specific signals in the IR spectrum that confirm the saponification of methyl salicylate to salicylic acid. please these absorptions and stretches should be discussed
Transcribed Image Text:This type of reaction is known more broadly as a saponification reaction. An ester can be
hydrolyzed to a carboxylic acid and an alcohol by-product under either acidic or basic
conditions.
&=&
1. NaOH
2. H₂SO4
OH
methyl salicylate
OH
salicylic acid
OH
+ H₂O + CH3OH
In the first part of the reaction, methyl salicylate (an ester) is treated with an aqueous base,
sodium hydroxide. The product of this reaction is the disodium salt of salicylic acid. To isolate
the acid, the reaction mixture is acidified with sulfuric acid. The overall organic products of this
reaction are salicylic acid and methanol.
OH
e
Na
OH
OH
O Na
NaOH
NaOH
* =* =* = &
H3O+
methyl salicylate
Water insoluble salt
Water soluble salt
salicylic acid
Na
+ H₂O + CH3OH
Transcribed Image Text:4000
Wavenumbers (cm-1)
3500
3000
2500
2000
1500
1000
45-
50-
1481.51 1463.64
783.94.
55-
756.10
690.62
60-
657.64
1652.36
1441.15
1291.06
%Transmittance
1323.88
1208.04
1609.36
1243.14
1152.66
886.99
7
75
1578.64
1030.47
1089.40
1382.95
852.31
964.44
567.76
80
3231.03
2837.85
2999.63
2591.76
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