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How to find the Conjugate acid-base pairs ?

Identify the conjugate acid-base pairs in each of the following

H2PO4- + OH-  <----->  HPO2-4  + H2O   Not sure if I wrote out the HP02 and 4 - right? there was a 2 then under it a 4 and then a negative next to it

 

HC1 + H2O ----> C1- + H2O+

 

NH3  + H2O <----->NH4+  + OH-

 

THANKS JEN

kingchemist Tue, 03/19/2013 - 06:14

No it is HPO42-. In this one this is the acid as it is providing the proton to react with OH- to form water. OH- is the base.

in the second equation the product is H3O+ and the reactant is HCl (hydrochloric acid)  not HC1. HCl is the acid as it provides the proton while water is the base as it accepts the proton.

In the last one NH3 is the base as it accepts a proton from water and water is the acid.