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Each row of the table below describes an aqueous solution at about \( 25^{\circ} \mathrm{C} \).
Complete the table. That is, fill in any missing entries in the second and third columns. Round your entries for \( \left[\mathrm{H}_{3} \mathrm{O}^{+}\right] \)to 2 significant digits, and your entries for pH to 2 decimal places.
\begin{tabular}{|c|c|c|}
\hline solution & {\( \left[\mathrm{H}_{3} \mathrm{O}^{+}\right] \)} & pH \\
\hline A & \( 1.7 \times 10^{-12} \mathrm{~mol} / \mathrm{L} \) & \( \square \) \\
\hline B & \( \square \mathrm{mol} / \mathrm{L} \) & 6.40 \\
\hline C & \( 9.0 \times 10^{-4} \mathrm{~mol} / \mathrm{L} \) & \( \square \) \\
\hline
\end{tabular}
\( \square \)
Explanation
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