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)

2 answers

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