Arrange the following 0.10 M solutions from lowest to highest pH: NaF, NaC₂H₃O₂, C₅H₅NHCl, KOH, HCN. (K_a for HCN is 6.2 × 10^-10; K_a for HF is 7.2 × 10^-4; K_a for HC₂H₃O₂ is 1.8 × 10^-5; and K_b for C₅H₅N is 1.7 × 10^-9) A) C₅H₅NHCl, HCN, NaF, NaC₂H₃O₂, KOH B) NaF, NaC₂H₃O₂, HCN, C₅H₅NHCl, KOH C) KOH, NaC₂H₃O₂, NaF, HCN, C₅H₅NHCl D) HCN, C₅H₅NHCl, NaF, NaC₂H₃O₂, KOH E) none of these

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Quizplus · Accepted Answer

The correct order from lowest to highest pH is determined by the nature of the solutions (acidic, basic, or neutral) and the strength of the acids or bases. C₅H₅NHCl (NH4Cl) is acidic due to the NH4+ ion, HCN is a weak acid, NaF and NaC₂H₃O₂ (sodium saccharinate) are basic due to the anions, and KOH is a strong base.

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