If equal moles of boric acid (H3BO3) and NaOH fully react, what species would be in solution at the end of the reaction?? 1) H3O+
2) OH-
3) H2BO3-
4) H3BO3
5) OH- and H3O+

The reaction between boric acid and sodium hydroxide is an example of a weak acid strong base reaction.

Boric acid is a weak acid while sodium hydroxide is a strong base.

Having that in mind, we know that a weak acid dissociates only to a small extent in solution while a strong base is almost 100% ionized in solution.

It the follows that a lot of OH- will be left behind after the reaction since only a little fraction of it reacts with the H^+ from boric acid.

Hence, if equal moles of boric acid (H3BO3) and NaOH fully react, OH- is left in the solution after reaction.

do u have any choices to choose from ? ?

it is the most commonly accepted one