A base has a Kb of 2.5 x 10–11. Which of the following statements is true?
This is a concentrated base.
This base ionizes slightly in aqueous solution.
This is a strong base.
An aqueous solution of this base would be acidic.
(do explain. i don't understand this one)
The base ionizes slightly in aqueous solution.
Statement one could be true or it may not be true. The concn is not listed; therefore, we don't know if statement 1 is true or not.
propan-2-ol + H2SO4 / K2CrO7 with heating
To determine which statement is true, we need to understand the concept of base strength and the significance of Kb.
Kb, or the base dissociation constant, is a measure of the strength of a base in solution. It indicates the extent to which the base ionizes or dissociates in water.
Now, let's take a look at the given value of Kb for the base, which is 2.5 x 10–11.
To assess the base strength based on the Kb value:
1. A high Kb value indicates a strong base, as it denotes a high degree of ionization in water.
2. A low Kb value indicates a weak base, as it signifies a minimal degree of ionization in water.
Given that the Kb value for the base is relatively small (2.5 x 10–11), it leads us to conclude that this base is weak, as it only partially ionizes in aqueous solution.
So, the true statement out of the options provided is: "This base ionizes slightly in aqueous solution."