Textbook Question
Predict the products (if any) of the following acid–base reactions.
(a) acetic acid + ammonia
(b) phthalic acid + excess NaOH
(c) p-toluic acid + potassium trifluoroacetate
Ch. 20 - Carboxylic Acids
Wade9th EditionOrganic ChemistryISBN: 9780135213728
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Table of contents
- Ch.1 - Structure and Bonding107
- Ch. 2 - Acids and Bases; Functional Groups115
- Ch.3 - Structure and Stereochemistry of Alkanes100
- Ch.4 - The Study of Chemical Reactions99
- Ch.5 - Stereochemistry93
- Ch.6 - Alkyl Halides; Nucleophilic Substitution118
- Ch. 7 - Structure and Synthesis of Alkenes; Elimination158
- Ch.8 - Reactions of Alkenes171
- Ch.9 - Alkynes91
- Ch.10 - Structure and Synthesis of Alcohols143
- Ch.11 - Reactions of Alcohols104
- Ch. 12 - Infrared Spectroscopy and Mass Spectrometry22
- Ch. 13 - Nuclear Magnetic Resonance Spectroscopy45
- Ch. 14 - Ethers, Epoxides, and Thioethers72
- Ch. 15 - Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy89
- Ch. 16 - Aromatic Compounds74
- Ch. 17 - Reactions of Aromatic Compounds126
- Ch. 18 - Ketones and Aldehydes193
- Ch. 19 - Amines129
- Ch. 20 - Carboxylic Acids77
- Ch. 21 - Carboxylic Acid Derivatives141
- Ch. 22 - Condensations and Alpha Substitutions of Carbonyl Compounds175
- Ch. 23 - Carbohydrates and Nucleic Acids93
- Ch. 24 - Amino Acids, Peptides, and Proteins54
Chapter 20, Problem 30d,e
Predict the products (if any) of the following acid–base reactions.
(d) α-bromopropionic acid + sodium propionate
(e) benzoic acid + sodium phenoxide
Verified step by step guidance1
Step 1: Understand the nature of the reactants. In both reactions, you are dealing with acid-base chemistry. Acids donate protons (H⁺), while bases accept protons. Identify the acidic and basic components in each reaction. For (d), a-bromopropionic acid is the acid, and sodium propionate is the base. For (e), benzoic acid is the acid, and sodium phenoxide is the base.
Step 2: Write the chemical formulas for the reactants. For (d), a-bromopropionic acid is CH₂BrCH₂COOH, and sodium propionate is CH₃CH₂COONa. For (e), benzoic acid is C₆H₅COOH, and sodium phenoxide is C₆H₅ONa.
Step 3: Predict the proton transfer. In an acid-base reaction, the acid donates a proton to the base. For (d), CH₂BrCH₂COOH will donate its proton (H⁺) to CH₃CH₂COO⁻ (the conjugate base of sodium propionate). For (e), C₆H₅COOH will donate its proton to C₆H₅O⁻ (the conjugate base of sodium phenoxide).
Step 4: Write the products of the reaction. For (d), the products will be CH₂BrCH₂COO⁻ (the conjugate base of a-bromopropionic acid) and CH₃CH₂COOH (propionic acid). For (e), the products will be C₆H₅COO⁻ (the conjugate base of benzoic acid) and C₆H₅OH (phenol).
Step 5: Consider equilibrium and reactivity. Acid-base reactions often favor the formation of the weaker acid and base. Compare the pKa values of the acids involved (a-bromopropionic acid vs. propionic acid in (d), and benzoic acid vs. phenol in (e)) to determine the direction of equilibrium. This step helps confirm the likelihood of the reaction proceeding as written.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Acid-Base Reactions
Acid-base reactions involve the transfer of protons (H+) between reactants. In these reactions, acids donate protons while bases accept them. Understanding the strength of the acids and bases involved is crucial, as it determines the direction of the reaction and the stability of the products formed.
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The Lewis definition of acids and bases.
Conjugate Acid-Base Pairs
In acid-base chemistry, every acid has a corresponding conjugate base, and every base has a corresponding conjugate acid. When an acid donates a proton, it becomes its conjugate base, and when a base accepts a proton, it becomes its conjugate acid. Recognizing these pairs helps predict the products of the reaction and their relative strengths.
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Equilibrium in Acid-Base Reactions
Acid-base reactions often reach an equilibrium state where both reactants and products are present. The position of this equilibrium is influenced by the relative strengths of the acids and bases involved. Understanding Le Chatelier's principle can help predict how changes in concentration or conditions will affect the equilibrium and the products formed.
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Related Practice
Textbook Question
Show how you would use extractions with a separatory funnel to separate a mixture of the following compounds: benzoic acid, phenol, benzyl alcohol, aniline
5
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Textbook Question
Given the structure of ascorbic acid (vitamin C):
(a) Is ascorbic acid a carboxylic acid?
(b) Compare the acid strength of ascorbic acid (pKa = 4.71) with acetic acid.
1
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Textbook Question
Arrange each group of compounds in order of increasing acidity.
(a) phenol, ethanol, acetic acid
(b) p-toluenesulfonic acid, acetic acid, chloroacetic acid
(c) benzoic acid, o-nitrobenzoic acid, m-nitrobenzoic acid
(d) butyric acid, α-bromobutyric acid, β-bromobutyric acid
(e)
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Textbook Question
Rank the following isomers in order of increasing boiling point, and explain the reasons for your order of ranking.
2
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Textbook Question
Arrange each group of compounds in order of increasing basicity.
c. sodium benzoate, sodium ethoxide, and sodium phenoxide
d. pyridine, sodium ethoxide, and sodium acetate
1
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