First slide

Orthoboric acid

Question

The colour observed by burning the vapours obtained by heating a mixture of borax or boric acid with C₂H₅OH and H₂SO₄ is :

Moderate

A

green
B

deep blue
C

yellow
D

red

Solution

${Na}_{2} B_{4} O_{7} + H_{2} {SO}_{4} + 5 H_{2} O \overset{}{\to} {Na}_{2} {SO}_{4} + 4 H_{3} {BO}_{3}$
$H_{3} {BO}_{3} + 3 C_{2} H_{5} OH \overset{H_{2} {SO}_{4}}{\to} \underset{\begin{array}{l} Burns with \\ green flame \end{array}}{{(C_{2} H_{5})}_{3} {BO}_{3}} + 3 H_{2} O$

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