• # question_answer 69)   Explain the nature of boric acid as a Lewis acid in water.

Boric acid does not behave as a protonic acid but behaves as a Lewis acid, i.e., it accepts a pair of electrons from $O{{H}^{-}}$ ion of the water molecule in aqueous solution. $H-OH+B{{(OH)}_{3}}\xrightarrow{{}}{{[B{{(OH)}_{4}}]}^{-}}+{{H}^{+}}$ [For more details see the answer of question 6.]