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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 the H₂PO₄⁻ ion
Answer
The conjugate base of an acid can be found by removing one proton (H⁺) from it. In this case, the H₂PO₄⁻ ion is the dihydrogen phosphate ion. When a proton is removed from H₂PO₄⁻, it becomes HPO₄²⁻, which is the hydrogen phosphate ion. Therefore, the correct answer is (C) HPO₄²⁻.