Question

Question 11.6 Explain what happens when boric acid is heated.

Class XI The p-Block Elements Page 323

Answer 1

When boric acid heated it evaporation is taken place

Answer 2

Boric acid , on heating loses water in three different stages at different temperature ultimately giving boron trioxide.
when we heat boric acid at 370K,
H3BO3 -------> HBO2 (Metaboric acid ) + H2O

again, Metaboric acid heat at 410K ,
4HBO2 ------>H2B4O7 (tetraboric acid) + H2O ------- red heat ---> 2B2O3 (boron trioxide) + H2O