Question

Which of the following bases is the weakest? Explain your answer.

(CH3)2NH, Kb = 5.1 x 10^–4
ClO2–, Kb = 2.9 x 10^–6
ClO2–, Kb = 8.3 x 10^–13
a) (CH3)2NH
b) ClO2– (Kb = 2.9 x 10^–6)
c) ClO2– (Kb = 8.3 x 10^–13)
d) All bases are equally weak

Answer 1

The weakest base among the given options is ClO2− with a Kb = 8.3 x 10–13, as it has the smallest Kb value, indicating the lowest tendency to ionize and produce hydroxide ions.

Step-by-step explanation:

The strength of a base is indicated by its Kb value, which represents the base ionization constant. A larger Kb value means the base is stronger, because it ionizes more in solution, producing more hydroxide ions. To determine which base is the weakest, we look for the base with the smallest Kb value.

• (CH3)2NH, Kb = 5.1 x 10–4
• ClO2−, Kb = 2.9 x 10–6
• ClO2−, Kb = 8.3 x 10–13

Based on the given values, the weakest base is the one with the smallest Kb value, which is ClO2− with a Kb = 8.3 x 10–13.