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On heating a borate with ethyl alcohol a...

On heating a borate with ethyl alcohol and cone. `H_(2)SO_(4)`, a green edged flame is noticed. How will you account for it?

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Upon borate reacts with `H_(2)SO_(4)` to form boric acid `(H_(3)BO_(3))` which forms triethyl borate (ester) with ethyl alcohol the vapours formed upon heating burn with green edged flame.
`H_(3)BO_(3)+3C_(2)H_(5)Ohrarr(C_(2)H_(5)O)_(3)B+3H_(2)O`
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