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Question

What must be the concentration of CH3COO- ion in 0.40 M CH3COOH to produce a buffer solution with pH = 4.80? (Ka CH3COOH = 1.8 ×10^-5) A) 4.74 B) 1.6 ×10^-5 C) 0.40 D) 0.46 E) 2.7 ×10^-3