A base has a Kb of 2.5 x 10–11. Which of the following statements is true?
A.This is a concentrated base.
B.This base ionizes slightly in aqueous solution.
C.This is a strong base.
D.An aqueous solution of this base would be acidic.
My answer is D...?
The correct answer is B. This base ionizes slightly in aqueous solution.
When a base ionizes in water, it produces hydroxide ions (OH-) which can react with water to increase the concentration of hydroxide ions in the solution. The extent of ionization of a base is determined by its Kb value. A smaller Kb value indicates that the base ionizes to a lesser extent, therefore producing fewer hydroxide ions in solution.
In this case, the Kb value of 2.5 x 10^-11 is relatively small, suggesting that the base does not ionize completely in aqueous solution. Therefore, the statement "This base ionizes slightly in aqueous solution" is true.
To determine the correct answer, we need to understand the concept of Kb and its relationship with the strength of a base.
Kb, or base dissociation constant, is a measure of the extent to which a base ionizes or dissociates in water. It indicates the strength of a base.
The general rule is that a larger Kb value indicates a stronger base, while a smaller Kb value indicates a weaker base.
Given that the Kb value of the base in question is 2.5 x 10–11, we can conclude that this base has a relatively small Kb value.
Therefore, the correct answer is B: This base ionizes slightly in aqueous solution.