I understand that the percent of total ammonia present as un-ionized ammonia (NH3) is dependent on pH and temperature, but I am trying to figure out exactly why and how. I have seen statements that the equilibrium constant of the ammonia/ammonium equilibrium reaction is dependent on pH and temperature, but I believe that this is sloppy terminology. A change in temperature would result in a change in the constant, but changing the pH would not. Changing pH would be akin to a change in concentration, wouldn't it?
I am trying to get a better understanding of equilibrium constants and how they relate to pH in general, and would appreciate any help. Any insights would be appreciated.
Thanks!