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A solution is prepared by mixing equal volumes of \( 0.4 \mathrm{M} \mathrm{CH}_{3} \mathrm{COOH} \) and \( 0.2 \mathrm{M} \mathrm{CH}_{3} \mathrm{COONa} \). \( \mathrm{K}_{a} \) for \( \mathrm{CH}_{3} \mathrm{COOH} \) is \( 1 \times 10^{-6} \). The \( \mathrm{pH} \) of the resulting solution would be
(A) 6
(B) \( 5.7 \)
(C) \( 6.7 \)
(D) 6
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