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What is meant by conjugate acid-base pair? Find the conjugate acid / base for the following species

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What is meant by conjugate acid-base pair? Find the conjugate acid / base for the following species

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HNO2 , CH- , HCIO4 , OH- , CO2-3 , S2- 

An acid-base pair which differs by a proton only (HA ⇌ A- + H+) is known as conjugate acid-base pair. 

Conjugate acid: HCN, H2O, HCO-3 , HS- . 

Conjugate base: NO-2 , ClO-4 , O-2

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