Explain effect of heating on Borax

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On heating, borax loses its water of crystallisation and swells up to form a puffy mass. On further heating, it melts into a clear liquid which solidifies to form a transparent glass like bead, called bprax bead, which comprises of sodium metaborate and boric anhydride. Na2B4O7.10H2O  Na2B4O7 + 10H2O Na2B4O7   2NaBO2 + B2O3 

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Borax on heating, initially swells up by the elimination of water molecules and on further heating at high temperature, a glassy transparent solid mass appears known as sodium metaborate. The reaction is shown as: Na2B4O7.10H2O --heat--> Na2B4O7 (anhydrous form) -- heat/ 7400C--> 2​NaBO2 + ​B2O3 (sodium metaborate)
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