First slide

Orthoboric acid

Question

Boric acid when burnt with ethyl alcohol gives a green edged flame due to the combustion of

Moderate

A

boric anhydride
B

metaboric acid
C

ethyl borate
D

orthoboric acid

Solution

$\mathop {B{{(OH)}_3}}\limits_{Ortho\,boric\,\,acid} + \mathop {3{C_2}{H_5}OH}\limits_{Ethyl\,\,alcohol} \xrightarrow{{Conc.{H_2}S{O_4}}}\mathop {B{{(O{C_2}{H_5})}_3}}\limits_{Triethyl\,\,\,borate}$
When ortho boric acid is burnt with ethyl alcohol in presence of Conc H₂SO₄ gives triethyl ortho borate.
When the vapours of triethyl borate ignited burn with a green edged flame.The green edged flame is due to the combustion of ethyl borate.
This test is used to detect the borates and boric acid in qualitative analysis.

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