31. 假設等濃度的共軛酸鹼對,下列那一組適宜製備 pH 9.2–9.3 的緩衝溶液?(A) CH3COONa/CH3COOH (Ka = 1.8 x 10–5)(B) NH3/NH4Cl (Ka =
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31. 假設等濃度的共軛酸鹼對,下列那一組適宜製備 pH 9.2–9.3 的緩衝溶液? (A) CH3COONa/CH3COOH (Ka = 1.8 x 10–5) (B) NH3/NH4Cl (Ka = 5.6 x 10–10) (C) NaOCl/HOCl (Ka = 3.2 x 10–8) (D) NaNO2/HNO2 (Ka = 4.5 x 10–4)