Open Question
Given that a base has a Kb value of 8.36×10−4, what is the Ka of its conjugate acid?
17. Acid and Base Equilibrium
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
Identify that the problem is asking for the Bronsted-Lowry base with the greatest concentration of hydroxide ions, which is related to the base's ability to accept protons and produce OH⁻ ions in solution.
Understand that the base dissociation constant (Kb) is a measure of the strength of a base in solution. A higher Kb value indicates a stronger base, which means it will produce more hydroxide ions (OH⁻) in solution.
List the given bases along with their Kb values: 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).
Compare the Kb values of the given bases. The base with the highest Kb value will have the greatest concentration of hydroxide ions in solution.
Determine that C3H7NH2, with a Kb of 3.5 x 10⁻⁴, has the highest Kb value among the given options, indicating it is the strongest base and will produce the greatest concentration of hydroxide ions.
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