Organic Chemistry
11th Edition
ISBN: 9781118133576
Author: T. W. Graham Solomons, Craig Fryhle
Publisher: Wiley, John & Sons, Incorporated
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Chapter 17, Problem 10PP
Practice Problem 17.9
Esters can also be synthesized by transesterification:
In this procedure we shift the equilibrium to the right by allowing the low-boiling alcohol to distill from the reaction mixture. The mechanism for transesterification is similar to that for an acid-catalyzed esterification (or an acid-catalyzed ester hydrolysis). Write a detailed mechanism for the following transesterification:
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Using the conditions of spontaneity to deduce the signs of AH and AS
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy
AS.
Note: if you have not been given enough information to decide a sign, select the "unknown" option.
reaction
observations
conclusions
A
This reaction is always spontaneous, but
proceeds slower at temperatures above
120. °C.
ΔΗ is
(pick one)
AS is
(pick one)
ΔΗ is
(pick one)
B
This reaction is spontaneous except above
117. °C.
AS is
(pick one)
ΔΗ is
(pick one)
This reaction is slower below 20. °C than
C
above.
AS is
|(pick one)
?
18
Ar
1
Calculating the pH at equivalence of a titration
Try Again
Your answer is incorrect.
0/5
a
A chemist titrates 70.0 mL of a 0.7089 M hydrocyanic acid (HCN) solution with 0.4574M KOH solution at 25 °C. Calculate the pH at equivalence. The pK of
hydrocyanic acid is 9.21.
Round your answer to 2 decimal places.
Note for advanced students: you may assume the total volume of the solution equals the initial volume plus the volume of KOH solution added.
pH
=
11.43]
G
00.
18
Ar
B•
Chapter 17 Solutions
Organic Chemistry
Ch. 17 - Practice Problem 17.1 Give an IUPAC systematic...Ch. 17 - Prob. 2PPCh. 17 - PRACTICE PROBLEM
17.3 Which acid of each pair...Ch. 17 - Practice Problem 17.3 Write structural formulas...Ch. 17 - Practice Problem 17.4
Show how each of the...Ch. 17 - Practice Problem 17.5
Show how you could prepare...Ch. 17 - Practice Problem 17.6
(a) Which of the carboxylic...Ch. 17 - Prob. 8PPCh. 17 - Prob. 9PPCh. 17 - Practice Problem 17.9
Esters can also be...
Ch. 17 - Prob. 11PPCh. 17 - Prob. 12PPCh. 17 - Practice Problem 17.12
What products would you...Ch. 17 - Practice Problem 17.13 (a) Provide the reagents...Ch. 17 - Prob. 15PPCh. 17 - Practice Problem 17.15 Using decarboxylation...Ch. 17 - Practice Problem 17.16 Diacyl peroxides, ,...Ch. 17 - Prob. 18PCh. 17 - Give an IUPAC systematic or common name for each...Ch. 17 - Prob. 20PCh. 17 - Prob. 21PCh. 17 - 17.21 What major organic product would you expect...Ch. 17 - Prob. 23PCh. 17 - Prob. 24PCh. 17 - Prob. 25PCh. 17 - Prob. 26PCh. 17 - 17.26 What products would you expect to obtain...Ch. 17 - Write structural formulas for the major organic...Ch. 17 - 17.28 Indicate reagents that would accomplish each...Ch. 17 - Write structural formulas for the major organic...Ch. 17 - Prob. 31PCh. 17 - Prob. 32PCh. 17 - Prob. 33PCh. 17 - 17.33 On heating,...Ch. 17 - Prob. 35PCh. 17 - Prob. 36PCh. 17 - 17.36 Show how pentanoic acid can be prepared from...Ch. 17 - 17.37 The active ingredient of the insect...Ch. 17 - Prob. 39PCh. 17 - Prob. 40PCh. 17 - Give stereochemical formulas for compounds AQ:...Ch. 17 - 17.41 -Glyceraldehyde can be transformed into...Ch. 17 - Prob. 43PCh. 17 - 17.44 Cantharidin is a powerful vesicant that can...Ch. 17 - Prob. 45PCh. 17 - 17.44 Given here are the NMR spectra and carbonyl...Ch. 17 - Compound X (C7H12O4) is insoluble in aqueous...Ch. 17 - 17.45 Compound Y dissolves slowly when warmed...Ch. 17 - Prob. 49PCh. 17 - Prob. 50PCh. 17 - 17.52 Starting with 1-naphthol, suggest an...Ch. 17 - Suggest a synthesis of ibuprofen (Section 5.11)...Ch. 17 - Prob. 53PCh. 17 - Prob. 54PCh. 17 - Prob. 1LGPCh. 17 - Prob. 2LGPCh. 17 - Prob. 3LGPCh. 17 - Prob. 4LGPCh. 17 - Prob. 1QCh. 17 - 17.2 Which of the following would yield...Ch. 17 - 17.3 Which reagent would serve as the basis for a...Ch. 17 - Prob. 4QCh. 17 - Complete the following synthesis.Ch. 17 - 17.6 Which of these acids would undergo...
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