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 certainorganic 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 complexwith [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+2H2O⇌B(OH)−4+H3O+