Assuming Equal Concentrations of Conjugate Base and Acid, Which One

question 107

Multiple Choice

Assuming equal concentrations of conjugate base and acid, which one of the following mixtures is suitable for making a buffer solution with an optimum pH of 4.6-4.8?

• A)CH₃COO₂Na / CH₃COOH (K_a = 1.8 × 10^-5)
• B)NH₃ / NH₄Cl (K_a = 5.6 × 10^-10)
• C)NaOCl / HOCl (K_a = 3.2 × 10^-8)
• D)NaNO₂ / HNO₂ (K_a = 4.5 × 10^-4)
• E)NaCl / HCl

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