Both are confusing me. I dont know what information to use (K values) I'd really appreciate some help! Calculate the concentration of all species present in a 0.25M solution of ethylammonium chloride (C2H5NH3CL) (Not sure you if you may need this, but C2H5NH2 has a Kb value of 5.6*10^-4... it is not given in the question, it's in the appendixes of my book, which are used a lot in these problems) Calculate the pH of a 0.050M Al(NO3)3 solution. Ka value for Al(H2O)6 3+ is 1.4*10^-5. EDIT: hmmm after reading analyzing it a little bit, I think I'm supposed to find the Kb of C2H5NH2 for the first one.. in other words 1ee-14/5.6ee-4 right? And that would lead to the answer being [C2H5NH3 +] = 0.25M (% dissociation is insignificant) [Cl -] = 0.25M [H +] = [C2H5NH2] = 2.1ee-6M Does this look right?