Which of the following pairs will make an acidic buffer solution?  _____________ 0.10 M  HCl and 0.10 M  NH4Cl 0.10 M  HBr and 0.10 M  NaBr 0.10 M  HF and 0.10 M  MgF2 0.10 M  HNO3  and 0.10 M  KNO3

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