Explain what happens when boric acid is heated.
Explain what happens when boric acid is heated.
On heating orthoboric acid $\left( H _{3} BO _{3}\right)$ at $370 \,K$ or above, it changes to metaboric acid $\left( HBO _{2}\right)$ On further heating, this yields boric oxide $B _{2} O _{3}$.
${H_3}B{O_3}\xrightarrow[{370\,K}]{\Delta }\mathop {HB{O_2}}\limits_{Metaboric\,acid} \xrightarrow[{red\,hot}]{\Delta }\mathop {{B_2}{O_3}}\limits_{Boric\,\,oxide} $
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- [IIT 1999]
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