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When borax is dissolved in water...

When borax is dissolved in water

A

both `B(OH)_(3)` and `[B(OH)_(4)]^(-)`

B

only `B(OH)_(3)` is formed

C

only `[B(OH)_(4)]^(-)` is formed

D

None of these.

Text Solution

Verified by Experts

The correct Answer is:
A
`[B_(4)O_(5)(OH)_(4)]^(2) + 5H_(2)O rarr 2B(OH)_(3) + 2[B(OH)_(4)]^(-)` ltbtgt This confirms that borax is made up of two triangular `BO_(3)` units and two tetrahedral `BO_(4)` units.
When borax is used for titrating against acids, only `[B(OH)_(4)]^(-)` reacts with `HCl` :
`2[B(OH)_(4)]^(-) + 2H_(3)O^(+) rarr 2B(OH)_(3) + 4H_(2)O`
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