Which Solution Has the Lower pH?

[aaronfue]

Homework Statement

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 NaCH₃CO₂2. 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?

 

[janhaa]

Try to figure out which are neutral, bases and acids.
eg nitrates are neutral and and salts of weak acids are (weak) basic
and salts of weak bases are (weak) acidic