Calculate \( \mathrm{pH} \) of following solutions: \( \left(4 \mathrm{~g} \mathrm{CH}_{3} \math...

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Calculate \( \mathrm{pH} \) of following solutions:
\( \left(4 \mathrm{~g} \mathrm{CH}_{3} \mathrm{COOH}+4.1 \mathrm{~g} \mathrm{CH}_{3} \mathrm{COONa}\right) \) in \( 100 \mathrm{~mL} \) aqueous solution; \( \mathrm{K}_{\mathrm{a}} \) for \( \mathrm{CH}_{3} \mathrm{COOH}=1.8 \times 10^{-5} \)
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