Which one of the following pairs cannot be mixed together to form a buffer solution? A)NH₃, NH₄Cl B)NaC₂H₃O₂, HCl (C₂H₃O₂^- = acetate) C)RbOH, HBr D)KOH, HF E)H₃PO₄, KH₂PO₄

Question

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The pair RbOH and HBr cannot form a buffer solution because RbOH is a strong base and HBr is a strong acid, so they will fully dissociate in solution and not be able to maintain a stable pH. The other pairs listed all contain a weak acid and its conjugate base or a weak base and its conjugate acid, which can form a buffer solution.

Which One of the Following Pairs Cannot Be Mixed Together