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NCERT Class XI Chemistry Equilibrium Solutions

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Question : 35 of 73
Marks: +1, -0
What is meant by the conjugate acid-base pair? Find the conjugate acid/base for the following species :
HNO2,CN–,HClO4HNO_2, CN^{–}, HClO_4 , F–,OH–,CO32–F^{–}, OH^{–}, CO_3^{2–} and S2–S^{2–}
Solution:  
Conjugate acid-base pair : The pairs of acids and bases which are formed from each other by the gain or loss of a proton are called conjugate acid-base pairs.
Species Conjugate acid Conjugate base
HNO2HNO_2- NO2−NO_2^{-}
CN−CN^{-} HCN-
HClO4HClO_4- ClO4−ClO_4^{-}
F−F^{-} HF -
OH−OH^{-}H2OH_2O O2−O^{2-}
CO32−CO_3^{2-}HCO3−HCO_3^{-}-
S2−S^{2-} HS−HS^{-}; -
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