CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases
Problem
Three unknown monoprotic acids—A, B, and C—are titrated separately with the same 0.100 M NaOH solution under identical conditions. Their titration curves show the following pH values at the half-equivalence point:
• Acid A: pH = 4.25
• Acid B: pH = 3.60
• Acid C: pH = 5.10
Based on these data, which ranking correctly orders the acids from strongest to weakest?
(a) C > A > B
(b) B > A > C
(c) B > C > A
(d) A > C > B