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Question
What is meant by the conjugate acid-base pair? Find the conjugate acid/base for the following species:
HNO2, CN–, HClO4, F–, OH–, `"CO"_3^(2-)`, and S2–
Short/Brief Note
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Solution
A conjugate acid-base pair is a pair that differs only by one proton.
The conjugate acid-base for the given species is mentioned in the table below.
| Species | Conjugate acid-base |
| HNO2 | `"NO"_2^(-)` (base) |
| CN– | HCN (acid) |
| HClO4 | `"ClO"_4^(-)` (base) |
| F– | HF (acid) |
| OH– | `"H"_2"O" ("acid")//"O"^(2-)`(base) |
| `"CO"_3^(2-)` | `"HCO"_3^(-)` (acid) |
| `"S"^(2-)` | `"HS"^(-)` (acid) |
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