Question

Which of the following correctly explains the nature of boric acid in aqueous medium?

• A. $H_3{BO}_3\underset{}{\overset{H_{2}O}{\to }}{H}_3^{+}O+H_2{BO}_3^{-}$
• B. $H_3{BO}_3\underset{}{\overset{{2H}_{2}O}{\to }}{2H}_3^{+}O+H^{}{BO}_3^{2-}$
• C. $H_3{BO}_3\underset{}{\overset{{3H}_{2}O}{\to }}{3H}_3^{+}O+{BO}_3^{3-}$
• D. $H_3{BO}_3\underset{}{\overset{H_{2}O}{\to }}B{\left(OH\right)}_4^{-}+H^{+}$

Answer 1

The correct option is D $H_3{BO}_3\underset{}{\overset{H_{2}O}{\to }}B{\left(OH\right)}_4^{-}+H^{+}$

According to Bronsted-Lowry concept of acids and bases, an acid is a substance which can give a proton and a base is a substance which accepts a proton.

According to Lewis concept of acids and bases, an acid is a substance which can accept a lone pair of electrons whereas a base is a substance which can donate a lone pair of electrons.

$H_3{BO}_3+H_{2}O⟶B{\left(OH\right)}_4^{-}+H^{+}$
A Lewis monobasic acid.