Ethaneperoxoic acid, C₂H₄O₃, has a pK_a value of 8.20. It is a weaker acid when compared to ethanoic acid, C₂H₄O₂ (pK_a = 4.74). Why is ethaneperoxoic acid weaker than ethanoic acid in terms of acidity?

• A. Ethaneperoxoic acid has a lower concentration of hydrogen ions.
• B. Ethaneperoxoic acid has a lower atomic weight.
• C. Ethaneperoxoic acid has a less stable conjugate base.
• D. Ethaneperoxoic acid has a lower boiling point.

Answer: (C)