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Which of the following is the conjugate base of the H₂PO₄⁻ ion? (A) H₃PO₄ (B) H₃PO₃ (C) HPO₄²⁻ (D) HPO₃²⁻ - HSC - SSCE Chemistry - Question 10 - 2016 - Paper 1
Question 10
Which of the following is the conjugate base of the H₂PO₄⁻ ion? (A) H₃PO₄ (B) H₃PO₃ (C) HPO₄²⁻ (D) HPO₃²⁻
Worked Solution & Example Answer:Which of the following is the conjugate base of the H₂PO₄⁻ ion? (A) H₃PO₄ (B) H₃PO₃ (C) HPO₄²⁻ (D) HPO₃²⁻ - HSC - SSCE Chemistry - Question 10 - 2016 - Paper 1
Step 1
Identify the conjugate base of H₂PO₄⁻
Answer
To determine the conjugate base of the dihydrogen phosphate ion (H₂PO₄⁻), we need to consider the Brønsted-Lowry theory of acids and bases. A conjugate base is formed when an acid donates a proton (H⁺).
In this case, if H₂PO₄⁻ donates one proton, it will become HPO₄²⁻. Therefore, the conjugate base of H₂PO₄⁻ is HPO₄²⁻.