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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 gives 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_(3)BO_(3)overset(373K)(to)4HBO_(2)+H_(2)O`
`4HBO_(2)overset(413K)(to)H_(2)B_(4)O_(7)+H_(2)O`
`H_(2)B_(4)O_(7)overset("Red hot")(to) 2B_(2)O_(3)+H_(2)O`
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