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What is the action of heat on orthoboric...

What is the action of heat on orthoboric acid ?

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Orthoboric acid on heating above 370 K, forms metaboric acid `( HBO_(2))` which on further heating forms a boric oxide .
`4H_(3)BO_(3) underset(-4H_(2)O)overset(370^(@) "heat") (rarr) underset("metaboric acid")(4HBO_(2))underset(-H_(2)O)overset(410 K) (rarr) underset("tetraboric acid")(H_(2)B_(4)O_(7))underset("hot"-H_(2)O) overset("Red")(rarr) underset ("boron trioxide") (2B_(2)O_(3))`
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