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 7.4–7.6?     NaOCl / HOCl (K a = 3.2 × 10 –8)     NH 3 / NH 4Cl (K a = 5.6 × 10 –10)     NaNO 2 / HNO 2 (K a = 4.5 × 10 –4)     NaCl / HCl     CH 3COONa / CH 3COOH (K a = 1.8 × 10 –5)

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