11. A buffer solution contains 0.5 M acetic acid 6169169d9e21a.jpg and 0.5 M sodium acetate. [H+] of the solution is
(A)616916c5c503b.jpg
(B)616916cdc89db.jpg
(C)616916d634756.jpg
(D)616916ddb98d1.jpgM.

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