Which Is the Best Acid to Prepare a Buffer with the Lowest

question 124

Multiple Choice

Which is the best acid to prepare a buffer with the lowest pH?

• A) C₅H₅O₅COOH, K_a = 4.0 × 10^-6
• B) HOC₆H₄OCOOH, K_a = 1.0 × 10^-3
• C) HBrO, K_a = 2.3 × 10^-9
• D) C₆H₄(COOH)₂, K_a = 2.9 × 10^-4
• E) CH₃COOH, K_a = 1.8 × 10^-5

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