Ch.15 - Acid and Base EquilibriumWorksheetSee all chapters
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Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: Which of the following acids has the weakest conjugate base? a. 3-chlorobenzoic acid,  Ka = 1.5x10-4b. hypochlorous acid, Ka = 2.9x10-8c. formic acid, Ka = 1.86x10-4d. chloroacetic acid, Ka = 1.26x10-

Problem

Which of the following acids has the weakest conjugate base? 

a. 3-chlorobenzoic acid,  Ka = 1.5x10-4

b. hypochlorous acid, Ka = 2.9x10-8

c. formic acid, Ka = 1.86x10-4

d. chloroacetic acid, Ka = 1.26x10-3

e. nitrous acid,  Ka = 4.5x10-4

Solution

We're being asked to identify which of the given acids has the weakest conjugate base.

Recall: The stronger an acid, the weaker its conjugate base, and, conversely, the stronger a base, the weaker its conjugate acid


We need to identify the strongest acid among the given. We can compare their Ka values:

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