Question

Orthoboric acid behaves as weak monobasic acid giving $H_3{O}^{+}$ and ____.

• A. $H_{2}B{O}_2^{+}$
• B. $H_{2}B{O}_2^{-}$
• C. $[B{\left(OH\right)}_4{]}^{-}$
• D. $[B{\left(OH\right)}_4{]}^{+}$

Answer 1

Answer: (C)

$[B{\left(OH\right)}_4{]}^{-}$

It is a Lewis acid. It accepts an electron pair from $O{H}^{-}$.

The reaction follows:

$B(OH{)}_3+2H_{2}O\rightleftharpoons [B(OH{)}_4{]}^{-}+H_3{O}^{+}$