The problem says to write the dissociation equation for C6H5NH3+ including water as a reactant.
Would it be this?
C6H5NH2 + H20 --> C6H5NH3+ + OH-
That's not exactly C6H5NH3+ dissociating but I don't understand how a positively charged thing can react with water.
Water can act as an acid or base depending on the other reactant. In this case, water would act as a base in which it would accept a proton from C6H5NH3+ to form the hydronium ion H3O+. You're left with an amine and the hydronium ion for products.
C6H5NH3+ + H2O ---> C6H5NH2 + H3O+
Water is a weak base, but it is a base, so it can react with water. Check out my picture.
Hope I helped!
C2H5NH2 + H2O â C2H5NH3 + OH-