1. The problem statement, all variables and given/known data I'm working on a practice exam and we have a question asking us to choose the solution that has the lower pH (most acidic). a) 0.1 M NaNO3 or 0.1 M KCH3CO2 b) 0.1 M NH4Br or 0.1 M NClO4 c) 0.1 M Fe(NO3)3 or 0.1 M CaCl2 d) 0.1 M NH3 or 0.1 M NaI e) 0.1 M NH4CH3CO2 or 0.1 M NaCH3CO2 2. The attempt at a solution I've read through some examples we did in class and what I thought it came down to was remembering which were strong and weak acids. I also just read something about transition metals? I thought that transition metals did not have an affect on pH? Or was that something else?