Which Acids/Bases React with Water to Produce Non-Neutral Solutions?

[SA32]

Homework Statement

Which of the substanced KCN, NaF, KBr, LiCl, and NH₄Br will react with water to produce non-neutral solutions?
a.) KCN, LiCl and NH₄Br
b.) KCN, NaF and NH₄Br
c.) NaF, LiCl and NH₄Br
d.) NaF, KBr and NH₄Br
e.) KCN, KBr and LiCl

Homework Equations

The Attempt at a Solution

Okay, so I ruled out e because NH₄⁺ is a weak acid and should produce a non-neutral solution in water. The rest all appear to be conjugate bases of acids, but I'm having trouble deciding which ones will result in a non-neutral pH.

So... I guess I've been given the conjugate bases of two weak acids (HCN and HF) and the conjugate bases of two strong acids (HBr and HCl) I'm thinking... since HBr and HCl are strong acids, the Cl- and Br- in LiCl and KBr added to water aren't going to do much. Whereas maybe the F- in NaF and CN- in KCN would set up an equilibrium in water? So I guess I'm thinking b, but I'm really not sure. Any help is appreciated.

 

[chemisttree]

I agree with your logic...

 

[SA32]

Forgot I posted this! Thanks for your response. :)