Question:

Boric acid is an acid because its molecule

Updated On: Apr 20, 2025
  • contains replaceable $H^{+}$ ion
  • gives up a proton
  • accepts $OH^{-}$ from water releasing proton
  • combines with proton from water molecule
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The Correct Option is C

Solution and Explanation

Lewis Acid and Boric Acid 

Lewis acids are substances whose octet is incomplete and accept electrons. Boric acid is a monobasic weak acid. It does not liberate \(H ^{+}\) ion but instead accepts electrons from the \(OH ^{-}\) ion, i.e., it behaves as a Lewis acid.

Boric Acid Reaction

The reaction of boric acid can be represented as:

\(H_3PO_3 + H_2O \rightarrow B(OH)_4^{-} + H^{+}\)

Alternatively, the following reaction can also be observed:

\(B(OH)_3 + 2H_2O \rightarrow [B(OH)_4]^{-} + H_3O^{+}\)

Structure of Boric Acid

The structure of \(H_3BO_3\) is as shown below, where the octet of boron in \(H_3BO_3\) is incomplete. This incomplete octet allows boric acid to act as a Lewis acid, accepting electron pairs from other molecules.

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P-Block Elements

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