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Explain the action of heat on boric acid...

Explain the action of heat on boric acid .

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Boric acid when heated at 373 K given metaboric acid and at 413 K, it gives tetraboric acid . When heated at red hot , it gives boric anhydride which is a glassy mass.
`4H_3BO_3overset(375K)rarr4HBO_2+H_2O`
`4HBO_2overset(413K)rarrH_2B_4O_7+H_2O`
`H_2B_4O_7overset("Red hot ")rarr2B_2O_3+H_2O`
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