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Boric acid is an acid because its molecule
  • a)
    contains replaceable H+ ion
  • b)
    gives up a proton
  • c)
    accepts OH– from water releasing proton
  • d)
    combines with proton from water molecule
Correct answer is option 'C'. Can you explain this answer?
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Boric acid is an acid because its moleculea)contains replaceable H+ io...
Because of the small size of boron atom and presence of only six electrons in its valence shell, B(OH)3 accepts a pair of electrons from OH- ion of H20, releasing a proton. 

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Boric acid is an acid because its moleculea)contains replaceable H+ io...
Understanding Boric Acid
Boric acid (H3BO3) is often categorized as a weak acid due to its unique behavior in aqueous solution. Its classification as an acid can be understood through its interaction with water.
Mechanism of Action
- Proton Acceptance: Boric acid primarily acts as a Lewis acid. It accepts hydroxide ions (OH-) from water, leading to the release of protons (H+).
- Formation of Tetrahydroxyborate Ion: When boric acid interacts with water, it forms the tetrahydroxyborate ion (B(OH)4-) and releases a proton into the solution. This reaction can be represented as:
H3BO3 + H2O ⇌ B(OH)4- + H+
- Acidic Properties: The release of protons into the solution is what gives boric acid its acidic characteristics, even though it does not release H+ ions in the traditional sense of strong acids.
Comparison with Other Acids
- Weak vs. Strong Acids: Unlike strong acids that fully dissociate in solution, boric acid partially dissociates, making it a weak acid. Its ability to accept hydroxide ions distinguishes it from typical Arrhenius acids that donate protons directly.
- Role of Water: The interaction with water is crucial, as it facilitates the acceptance of OH- ions, which is essential for the acid-base reaction.
Conclusion
In summary, boric acid classifies as an acid primarily because it accepts hydroxide ions from water, resulting in the release of protons. This unique mechanism of action highlights the complexity of acid behavior in chemistry.
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Boric acid is an acid because its moleculea)contains replaceable H+ ionb)gives up a protonc)accepts OH–from water releasing protond)combines with proton from water moleculeCorrect answer is option 'C'. Can you explain this answer?
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