p-Block Elements-I - Result Question 37
8. $B(OH)_3 + NaOH \rightleftharpoons NaBO_2 + Na[B(OH)_4] + H_2O$
How can this reaction be made to proceed in the forward direction?
(2006, 3M)
(a) Addition of cis-1,2-diol
(b) Addition of borax
(c) Addition of trans 1,2-diol
(d) Addition of $Na _2 HPO _4$
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Answer:
Correct Answer: 8. (a)
Solution:
- Orthoboric acid is a very weak acid, direct neutralisation does not complete. However, addition of cis-diol allows the reaction to go to completion by forming a stable complex with $\left[B(OH)_4\right]^{-}$:
BETA
