Are all dynamic equilibrium reactions with neutralization, must also be buffers?

Reactions like: 


$\ce{H2CO3\_{(aq)} + H2O\_{(l)} <--> H3O+\_{(aq)} + HCO3-\_{(aq)}}$


**or**


$\ce{C5H5N\_{(aq)} + H2O\_{(l)} <--> C5H5NH+\_{(aq)} + OH-\_{(aq)}}$


Does that mean that the last stage of reaction of a buffer system must be of a weak acid/base?




Yes, because a buffer is basically a weak acid or weak base as far as I know. These hydronium ions are also like weak acids on top of carbonic acid which is also a weak acid. Carbonic acid is a weak acid. It has a pH of 5 or 6.


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