4. Which of the following combination gives the greatest buffer capacity?
(A) 0.05 M CH3COOH
(B) 0.05 M CH3COONa
(C) 0.01 M CH3COOH/CH3COONa (The mole ratio of CH3COOH/CH3COONa is 1.)
(D) 0.05 M CH3COOH/CH3COONa (The mole ratio of CH3COOH/CH3COONa is 1.)
(E) 0.05 M CH3COOH/CH3COONa (The mole ratio of CH3COOH/CH3COONa is 5.)

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