Chemistry: Which one of the following 1.0 M solutions...?

Posted on 2016-04-20 19:02:00 in Chemistry by KK

Which one of the following 1.0 M solutions would have the lowest pH? 

a. KF 
b. LiCN 
c. NaNO3 
d. NH3 
e. CH3NH3Cl 

What I am seeing is that a. is a weak acid, b. is a weak acid, c. is neutral, d. is a weak base, and e. is a weak acid. So, that leaves me with looking at a., b., and e. since they would be the ones with a low pH being that they are acidic. From here do I look at Ka value for HF with respect to a. KF, Ka for HCN for b. LiCN, and Ka for CH3NH2 for e.? Any help would be appreciated and if you could show me the steps, too. Thank you!

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