Question:medium
Basicity of orthophosphoric acid is
Basicity of orthophosphoric acid is
Updated On: Jun 24, 2026
- 2
- 3
- 4
- 5
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The Correct Option is B
Solution and Explanation
To determine the basicity of orthophosphoric acid (H3PO4), we need to understand its chemical structure and behavior during dissociation in water.
Basicity refers to the number of hydrogen ions (H+) an acid can donate. Orthophosphoric acid, H3PO4, is a triprotic acid, meaning it can donate three protons (H+ ions) in aqueous solutions. Let's break down its dissociation process:
- The first dissociation step releases one H+ ion: H_3PO_4 \rightarrow H^+ + H_2PO_4^−
- The second dissociation step releases the second H+ ion: H_2PO_4^- \rightarrow H^+ + HPO_4^{2-}
- The third dissociation step releases the third H+ ion: HPO_4^{2-} \rightarrow H^+ + PO_4^{3-}
Each of these steps results in the release of a hydrogen ion, making the basicity of orthophosphoric acid equal to 3.
Conclusion: The basicity of orthophosphoric acid is 3. This is why the correct answer to the question is 3.
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