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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–,  CO2–3  and  S-

Answer:

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– H2O(Acid) / O2-  (base)
CO2–3 HCO–3 (Acid)
S- HS- (Acid)


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