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May 23, 2015

Homework Help: APChem

Posted by Kiki on Sunday, March 21, 2010 at 10:38pm.

Hi I tried to understand this but I don't know why the answer is B:
Which one of the following pairs cannot be mixed together to form a buffer solution:
A) NaC2H3O2, HCl
B)RbOH, HBr
C) NH3, NH4Cl
D) H3PO4, KH2PO4
E) KOH, HF

The answer is B but could you explain why?
I know its not C because they are conj. acid base pairs..but NaC2H4O2 and HCl dont have a common ion...so I dont understand..?

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