I recently did an experiment with the following reaction: [tex]NH_4^+ + OH^-[/tex]<-->[tex]NH_3+H_2O[/tex] I added phenolphthlein, which is magenta in the presence of base. Now, I have to explain, after adding certain chemicals why I have certain color. The one color change I am having trouble explaining, though, is adding [tex]AgNO_3[/tex]. From a clear transparent pink, it went to a foggy pink. The fogginess is due to the Ag precipitate. But it is the pink I am having trouble explaining, since [tex]NO_3^-[/tex] is not a component of the reaction above. The way I explained it is that [tex]NO_3^-[/tex] is a conjugate base of [tex]HNO_3[/tex], so there is a basic substance added, and this turns the phth slightly pinkish. The question is, is my answer right, or is there something more to it?