What is the \( \mathrm{pH} \) of a solution of \( 0.28 \mathrm{M} \) acid and 0.84 \( \mathrm{M}....

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What is the \( \mathrm{pH} \) of a solution of \( 0.28 \mathrm{M} \) acid and 0.84
\( \mathrm{P} \)
\( \mathrm{M} \) of its conjugate base if the ionization constant of acid is \( 4 \times 10^{-4} \)
(1) 3.88
(2) 3.34
(3) 7
(4) 10.12


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