Textbook Question
Provide an arrow-pushing mechanism for the following hypothetical acid half-reactions. [These are only intended to help you learn about arrow pushing in acid–base reactions.]
(b)
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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 15b
Based on the one species that is identified for you, label the remaining molecules as acid, base, conjugate acid, or conjugate base.
(b) 
Verified step by step guidance1
Step 1: Identify the species already labeled in the reaction. In this case, H2PO4⁻ is labeled as a 'Base'. This means it accepted a proton (H⁺) during the reaction.
Step 2: Analyze the reactants. H3PO4 is a proton donor, as it loses a proton to form H2PO4⁻. Therefore, H3PO4 is the 'Acid' in this reaction.
Step 3: Examine the organic molecule on the left side of the reaction. It reacts with H3PO4 and gains a proton, forming the positively charged species on the right side. This indicates that the organic molecule is acting as a 'Base' because it accepts a proton.
Step 4: Look at the positively charged organic molecule formed on the right side of the reaction. Since it is the protonated form of the original organic molecule, it is the 'Conjugate Acid' of the base.
Step 5: Summarize the labels: H3PO4 is the Acid, the organic molecule on the left is the Base, the positively charged organic molecule on the right is the Conjugate Acid, and H2PO4⁻ is the Conjugate Base.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Acids and Bases
Acids are substances that can donate a proton (H+) in a chemical reaction, while bases are substances that can accept a proton. This concept is fundamental in understanding acid-base reactions, where the transfer of protons between species determines their classification as acids or bases.
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The Lewis definition of acids and bases.
Conjugate Acid-Base Pairs
A conjugate acid is formed when a base gains a proton, while a conjugate base is formed when an acid loses a proton. This relationship is crucial for identifying the species involved in acid-base reactions, as it helps to track the changes in protonation states of the molecules.
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Chemical Equilibrium
Chemical equilibrium refers to the state in which the rates of the forward and reverse reactions are equal, resulting in constant concentrations of reactants and products. Understanding this concept is essential for predicting the direction of acid-base reactions and the relative strengths of acids and bases in a given reaction.
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Related Practice
Textbook Question
Based on the one species that is identified for you, label the remaining molecules as acid, base, conjugate acid, or conjugate base.
(a)
1217
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Textbook Question
Based on the one species that is identified for you, label the remaining molecules as acid, base, conjugate acid, or conjugate base.
(c)
1105
views
Textbook Question
Using the convention that the acid and base are on the left side of the chemical equation, label the acid, base, conjugate acid, and conjugate base in the following reactions.
(b)
835
views
Textbook Question
Provide an arrow-pushing mechanism for the following hypothetical acid half-reactions. [These are only intended to help you learn about arrow pushing in acid–base reactions.]
(a)
1018
views
Textbook Question
Using the convention that the acid and base are on the left side of the chemical equation, label the acid, base, conjugate acid, and conjugate base in the following reactions.
(c)
1075
views