Question

Which of the following is correct for $H_{3}B{O}_3$ ?

• A. It has a layer structure in which planar $B{O}_3$ units are joined by hydrogen bonds
• B. It is obtained by acidifying an aqueous solution of borax.
• C. It does not act as a proton donor but acts as an lewis acid by accepting hydroxyl ions.
• D. All of the above.

Answer 1

The correct option is D All of the above.

It has a layer structure in which planar $B{O}_3$ units are joined by hydrogen bonds.

Preparation: Precipitated by acidifying an aqueous solution of borax.
$N{a}_2{B}_4{O}_7+2HCl+5H_{2}O\to 2NaCl+4H_{3}B{O}_3$

It is not a protonic acid but acts as a Lewis acid by accepting electrons from a hydroxyl ion.
$B(OH{)}_3+2H_{2}O\to B(OH{)}_4^{-}+H_3{O}^{+}$

Hence option d is correct.