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What is \( \left[\mathrm{H}^{+}\right] \)in \( \mathrm{mol} / \mathrm{L} \) of a solution that is \( 0.20 \mathrm{M} \) in \( \mathrm{CH}_{3} \mathrm{COONa} \) and \( 0.10 \mathrm{M} \) in \( \mathrm{CH}_{3} \mathrm{COOH} ? \mathrm{~K}_{\mathrm{a}} \) for \( \mathrm{CH}_{3} \mathrm{COOH} \) \( =1.8 \times 10^{-5} \).
(a) \( 3.5 \times 10^{-4} \)
(b) \( 1.1 \times 10^{-5} \)
(c) \( 1.8 \times 10^{-5} \)
(d) \( 9.0 \times 10^{-6} \)
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