MHT CET202522 Apr 2025Morning ShiftChemistryIonic EquilibriumActual
Identify the conjugate acid-base pair respectively from following equilibrium reaction. HPO _ 4( aq ) ²⁻+ H ₂ O _ ( ) PO _ 4( aq ) ³⁻+ H ₃ O _ ( aq ) ⁺
Options
- AH ₃ O ⁺ and H ₂ O
- BH ₂ O and HPO ₄²⁻
- CPO ₄³⁻ and H ₃ O ⁺
- DH ₃ O ⁺ and HPO ₄ ²⁻
Correct answer
A. H ₃ O ⁺ and H ₂ O
Step-by-step solution
In the equilibrium reaction HPO _ 4( aq ) ²⁻ + H ₂ O _ ( ) PO _ 4( aq ) ³⁻ + H ₃ O _ ( aq ) ⁺ , conjugate acid-base pairs consist of species differing by a single proton. HPO ₄²⁻ acts as an acid, donating a proton to form its conjugate base PO ₄³⁻ , while H ₂ O acts as a base, accepting a proton to form its conjugate acid H ₃ O ⁺ . Examining the options: A) H ₃ O ⁺ and H ₂ O correctly shows an acid followed by its conjugate base, differing by one proton. B) H ₂ O and HPO ₄²⁻ are not a conjugate pair. C) PO ₄³⁻ and