Author Question: Assuming equal concentrations of conjugate base and acid, which one of the following mixtures is ... (Read 39 times)

Tb12162018 · **on:** Nov 5, 2023

Question 1

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 9.2–9.3?
◦ CH₃COONa / CH₃COOH (K_a = 1.8 × 10^–5)
◦ NH₃ / NH₄Cl (K_a = 5.6 × 10^–10)
◦ NaOCl / HOCl (K_a = 3.2 × 10^–8)
◦ NaNO₂ / HNO₂ (K_a = 4.5 × 10^–4)
◦ NaCl / HCl

Question 2

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?
◦ CH₃COO₂Na / CH₃COOH (K_a = 1.8 × 10^–5)
◦ NH₃ / NH₄Cl (K_a = 5.6 × 10^–10)
◦ NaOCl / HOCl (K_a = 3.2 × 10^–8)
◦ NaNO₂ / HNO₂ (K_a = 4.5 × 10^–4)
◦ NaCl / HCl

hvhf4k+549qz8f218jyo@shar · **Reply #1 on:** Nov 5, 2023

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