Assuming equal concentrations of conjugate acid and base, which one of the following mixtures is suitable for making a buffer solution with an optimum pH of 4.6-4.8?
A) CH3COONa/CH3COOH (Ka = 1.8 × 10-5)
B) NH3/NH4Cl (Ka = 5.6 × 10-10)
C) NaOCl/HOCl (Ka = 3.2 × 10-8)
D) NaNO2/HNO2 (Ka = 4.5 × 10-4)
E) NaCl/HCl
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