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The P-Block Elements

Question
CBSEENCH11007296

Why is boric acid considered as a weak acid ?

Solution
Boric acid considered as a weak acid because it is not able to release H+ ions on its own. It receives OH ions from water molecule to complete its octet and in turn, releases H+ ions.
straight H space minus space OH space plus space straight B left parenthesis OH right parenthesis subscript 3 space rightwards arrow space space space left square bracket straight B left parenthesis OH right parenthesis subscript 4 right square bracket to the power of minus space plus space straight H to the power of plus
In other words, boric acid is not a protonic acid but acts as a Lewis acid by accepting electrons from a hydroxyl ion.