Question

how do you determine what species are present in NH3 soltuion? I don't understand what exactly the species are.

Answer 1

NH3 reacts with water as follows:
NH3 + HOH <--> NH4+ + OH^-
Now what is in the solution?
NH4^+, OH^-, and NH3(aq).
Those are the three species.

Answer 2

thanks. That makes sense now that i see it, i just forgot what species meant. Thanks for your help DrBob!