Answer
$$B(aq) + H_2O(l) \leftrightharpoons BH^+(aq) + OH^-(aq)$$
Work Step by Step
This generic equation can be found on the Topic "Weak Bases" on page 746.
A base is a substance that accepts a proton; the most common reactant is water, so we just have to write an equation where a generic substance receives a proton from water to produce its conjugate acid and the hydroxide ion.
