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Question
Explain what happens when boric acid is heated.
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Solution
On heating orthoboric acid (H3BO3) at 370 K or above, it changes to metaboric acid (HBO2). On further heating, this yields boric oxide B2O3.
\[\ce{H3BO3 ->[\Delta][370 K] \underset{Metaboric acid}{HBO2} ->[\Delta][red hot] \underset{\text{Boric oxide}}{B2O3}}\]
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