Question:
The correct statement(s) for orthoboric acid is/'are
The correct statement(s) for orthoboric acid is/'are
Updated On: Jun 14, 2022
- It behaves as a weak acid in water due to self ionisation
- Acidity of its aqueous solution increases upon addition of ethylene glycol
- It has a three-dimensional structure due to hydrogen bonding
- It is a weak electrolyte in water
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The Correct Option is D
Solution and Explanation
(a) It does not undergo self ionisation in water but accepts an electron pair from water, so it behaves as weak monobasic acid. $H_3BO_3 + H_2O \rightleftharpoons B(OH)^1_4 + H^+ $ Hence, (a) is incorrect
(b) When treated with 1, 2-dihydroxy or polyhydroxy compounds, they form chelate (ring complex) which effectively remove $[B(OH)_4]^-$ species from solution and thereby produce maximum number of $H3O^+ \, or \, H^+$ ions, i.e. results in increased acidity.
(c) Boric acid crystallises in a layer structure in which planar triangular $BO^{3-}_3$ ions are bonded together through hydrogen bonds.
(d) In water the pK a value of H3B 03 is 9.25.$H_3BO_3 + H_2O \rightleftharpoons B(OH)^-_4 + H^+ ; pK_a = 9.25 $ So, it is a weak electrolyte in water.
(b) When treated with 1, 2-dihydroxy or polyhydroxy compounds, they form chelate (ring complex) which effectively remove $[B(OH)_4]^-$ species from solution and thereby produce maximum number of $H3O^+ \, or \, H^+$ ions, i.e. results in increased acidity.
(c) Boric acid crystallises in a layer structure in which planar triangular $BO^{3-}_3$ ions are bonded together through hydrogen bonds.
(d) In water the pK a value of H3B 03 is 9.25.$H_3BO_3 + H_2O \rightleftharpoons B(OH)^-_4 + H^+ ; pK_a = 9.25 $ So, it is a weak electrolyte in water.
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Concepts Used:
P-Block Elements
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