. Although boric acid B(OH)2, contains three hydroxyl groups yet it behaves as a mono basic acid. Explain why


Best Answer

Answer: Because of the small size of boron atom and presence of only six electron in its valence shell in B(OH)3, it coordinates with the oxygen atom of the H2O molecule to form a hydrated species

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In this hydrated species B3+ ion because of its small size it has a high polarizing power and hence pulls the electron of the coordinated oxygen atom towards it. The coordinated O – atom, in turn pulls the s - electron of the O – H bond, there by facilitating the release of a proton. As a result, B(OH)3 acts a weak monobasic lewis acid and thus reacts with NaOH solution to form sodium metaborate. 

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