Textbook Question
For the following acid–base pairs, (vi) draw a reaction coordinate diagram.
(e)
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Ch. 4 - Acids and Bases: Electron Flow
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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Table of contents
- Ch. 2 - General Chemistry Translated: Finding the Electrons114
- Ch. 3 - Alkanes and Cycloalkanes: Properties and Conformational Analysis109
- Ch. 4 - Acids and Bases: Electron Flow144
- Ch. 5 - Chemical Reaction Analysis: Thermodynamics and Kinetics118
- Ch. 6 - Stereoisomerism: Arrangement of Atoms in Space112
- Ch. 7 - Principles of Green (Organic) Chemistry3
- Ch. 8 - Alkenes I: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes II: Oxidation and Reduction150
- Ch. 10 - Alkynes: Electrophilic Addition and Redox Reactions101
- Ch. 11 - Properties and Synthesis of Alkyl Halides: Radical Reactions108
- Ch. 12 - Substitution and Elimination: Reactions of Haloalkanes172
- Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination239
- Ch. 14 - Structural Identification I: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification II: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution I: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution II: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems I: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems II: Pericyclic Reactions54
- Ch. 23 - Benzene I: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene II: Reactions Influenced by the Aromatic Ring62
- Ch. 25 - Amines: Structure, Reactions, and Synthesis27
- Ch. 26 - Amino Acids, Proteins, and Peptide Synthesis9
- Ch. 27 - Carbohydrates, Nucleic Acids, and Lipids54
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471Not the one you use?Change textbook
Chapter 3, Problem 62e(iv)
For the following acid–base pairs, (iv) calculate Keq;
(e) 
Verified step by step guidance1
Step 1: Identify the acid and base on both sides of the equilibrium. In the given reaction, the acid on the left side is acetic acid (CH3COOH), and the base is ethanol (CH3CH2OH). On the right side, the conjugate base of acetic acid is acetate ion (CH3COO⁻), and the conjugate acid of ethanol is ethoxide ion (CH3CH2O⁻).
Step 2: Determine the pKa values of the acids involved. The pKa of acetic acid is approximately 4.76, and the pKa of ethanol is approximately 16. This information is crucial for calculating the equilibrium constant (Keq).
Step 3: Use the relationship between pKa values and Keq. The equilibrium constant for an acid-base reaction can be calculated using the formula: Keq = 10^(pKa(conjugate acid) - pKa(acid)).
Step 4: Substitute the pKa values into the formula. In this case, the conjugate acid is ethanol (pKa = 16), and the acid is acetic acid (pKa = 4.76). The formula becomes: Keq = 10^(16 - 4.76).
Step 5: Interpret the result. The calculated Keq will indicate the position of equilibrium. If Keq > 1, the equilibrium favors the products (right side). If Keq < 1, the equilibrium favors the reactants (left side).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Acid-Base Equilibrium
Acid-base equilibrium refers to the state where the rates of the forward and reverse reactions of an acid and its conjugate base are equal. This equilibrium is characterized by the equilibrium constant (Keq), which quantifies the ratio of the concentrations of products to reactants at equilibrium. Understanding this concept is crucial for calculating Keq for given acid-base pairs.
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Determining Acid/Base Equilibrium
Equilibrium Constant (Keq)
The equilibrium constant (Keq) is a numerical value that expresses the ratio of the concentrations of products to reactants at equilibrium for a reversible reaction. For acid-base reactions, Keq can be calculated using the concentrations of the acid and its conjugate base. A higher Keq value indicates a stronger tendency for the reaction to favor products, while a lower value suggests a preference for reactants.
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02:19The relationship between equilibrium constant and pKa.
Conjugate Acid-Base Pairs
Conjugate acid-base pairs consist of two species that differ by the presence or absence of a proton (H+). In any acid-base reaction, the acid donates a proton to form its conjugate base, while the base accepts a proton to form its conjugate acid. Recognizing these pairs is essential for understanding the dynamics of acid-base reactions and for calculating the equilibrium constant.
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Related Practice
Textbook Question
For the following acid–base pairs, (iii) predict the favored side of equilibrium;
(e)
1
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Textbook Question
For the following acid–base pairs,
(i) complete the reaction;
(ii) identify the acid (A), base (B), conjugate acid (CA), and conjugate base (CB);
(b)
Textbook Question
For the following acid–base pairs,
(i) complete the reaction;
(ii) identify the acid (A), base (B), conjugate acid (CA), and conjugate base (CB);
(c)
Textbook Question
Would you expect the following species to be electrophiles or nucleophiles? Some may be both. Explain your answer.
(h)
1
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Textbook Question
For the following acid–base pairs,
(i) complete the reaction;
(ii) identify the acid (A), base (B), conjugate acid (CA), and conjugate base (CB);
(e)