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How do I identify conjugate acid-base pairs?

I can identify what an acid is and a base in a given equation separately but im unsure if what I'm doing is correct

kingchemist Tue, 02/28/2012 - 04:14

NH3 + H2O <---> NH4+ + OH-

NH3 is a base because it accepts a proton (from water). Water is an acid because it donates a proton (to NH3). OH- is the conjugate base as it can accept a proton and NH4+ is the conjugate acid because it can donate a proton

Water can also be the base

HCl + H2O <---> H3O+ + Cl-

Water accepts a proton and behaves as a base. HCl provides the proton and is an acid. H3O+ is the conjugate acid of water as it can donate a proton. Cl- is the conjugate base of HCl as it can accept a proton (to make HCl again) is good