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When borax is heated with ethyl alcohol ...

When borax is heated with ethyl alcohol and concentrated sulpheric acid, vapors of triethylborate are produced. When ignited, these vapors burn with a ………..flame.

A

blue-edged

B

green-edged

C

red-edged

D

brown-edged

Text Solution

Verified by Experts

The correct Answer is:
B
`Na_(2)B_(4)O_(7) + H_(2)SO_(4) + 5H_(2)O rarr Na_(2)SO_(4) + 4H_(3)BO_(3)`
`H_(3)BO_(3) + 3C_(2)H_(5)OH rarr B(OC_(2)H_(5))_(3) + 3H_(2)O`
This reaction is used as a test for borate ion in qualitative analysis.
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