Multiple Choice
Which Bronsted-Lowry acid has the weakest conjugate base?
10. Acids and Bases
Ka and Kb
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Which Bronsted-Lowry base has the greatest concentration of hydroxide ions?
A
C2H8N2(Kb = 8.3 x 10-5)
B
C5H5N (Kb = 1.7 x 10-9)
C
(CH3)3N (Kb = 1.0 x 10-6)
D
C3H7NH2(Kb = 3.5 x 10-4)
E
C6H5NH2(Kb = 3.9 x 10-10)
Verified step by step guidance1
Understand that a Bronsted-Lowry base is a substance that can accept a proton (H+). In aqueous solutions, these bases will react with water to produce hydroxide ions (OH-).
The strength of a base in water is indicated by its base dissociation constant, Kb. A larger Kb value means the base is stronger and will produce more hydroxide ions in solution.
Compare the given Kb values for each base: C2H8N2 (Kb = 8.3 x 10^-5), C5H5N (Kb = 1.7 x 10^-9), (CH3)3N (Kb = 1.0 x 10^-6), C3H7NH2 (Kb = 3.5 x 10^-4), and C6H5NH2 (Kb = 3.9 x 10^-10).
Identify the base with the largest Kb value, as this base will have the greatest concentration of hydroxide ions in solution.
Conclude that C3H7NH2, with a Kb of 3.5 x 10^-4, has the greatest concentration of hydroxide ions among the given options.
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