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Asumming 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 to 4.8? (A) CH3COO2Na/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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