The dihydrogen phosphate ion undergoes these reactions in water.
H₂PO₄–(aq) + H₂O(l) ⇌ HPO₄₂–(aq) + H₃O⁺(aq) K = 6.2 × 10–8
H₂PO₄–(aq) + H₂O(l) ⇌ H₃PO₄(aq) + OH–(aq) K = 1.6 × 10–7
What is the conjugate base of H₂PO₄–?

Question

The dihydrogen phosphate ion undergoes these reactions in  water.
H2PO4–(aq) + H2O(l) ⇌ HPO42–(aq) + H3O+(aq) K = 6.2 × 10–8
H2PO4–(aq) + H2O(l) ⇌ H3PO4(aq) + OH–(aq) K = 1.6 × 10–7
What is the conjugate base of  H2PO4–?

Accepted Answer

Correct answer: A.

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