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.
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