Question

Explain what happens when boric acid is heated.

Answer 1

When boric acid is heated, boron trioxide is obtained.
$H_{3}B{O}_3\underset{373K}{\overset{Heat}{\to }}\underset{\text{Metaboric acid}}{HB{O}_2}+H_{2}O$

$4HB{O}_2\underset{-H_{2}O}{\overset{Heat}{\to }}{H}_2{B}_4{O}_7\stackrel{Heat}{\to }\underset{\text{Boron trioxide}}{2B_2{O}_3}+H_{2}O$