Ncert Exercises & Solutions

Explain what happens when boric acid is heated.

On heating orthoboric acid (

H_{3} B O_{3}

) at 370 K or above, it changes to metaboric acid (

H B O_{2}

).
On further heating, this yields boric oxide

B_{2} O_{3}

H_{3} B O_{3} \to_{370 K}^{∆} H B O_{2} \to_{r e d h o t}^{∆} B_{2} O_{3}

M e t a b o r i c a c i d B o r i c o x i d e