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Question

On addition of catechol to aqueous solution of boric acid, it will :

A
increase the pH of solution
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B
decrease the pH of the solution
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C
form polymeric metaborate species
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D
leave the solution undisturbed.
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Solution

The correct option is B decrease the pH of the solution
Boric acid is a weak monobasic acid.
When certain organic polyhydroxy compounds such as glycerol, mannitol, catechol or sugars are added, B(OH)3 behaves as a strong monobasic acid.

Here, catechol forms a very stable complex with [B(OH)4], removing it from the solution.

Thus, the removal of one of the products shifts the equilibrium in the forward direction. This will increase the H+ concentration solution. Thus the pH of solution will get decreased.
B(OH)3+2H2OB(OH)4+H3O+

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