Chemistry - Complete Pblock- Question with Solution | TestHub

Orthoboric acid is a weak mono basic acid with K_a=1.0 x 10^-9. It does not act as protonic acid (i.e. proton donor) but behaves as Lewis acid by accepting a pair of electrons from OH^-ion.

$\text{B}{\left(\text{OH}\right)}_3+2\text{H}-\text{O}-\text{H}\to {\left[\text{B}{\left(\text{OH}\right)}_4\right]}^{-}+{\text{H}}_3{\text{O}}^{+}$