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Chapter 16: Problem 109
Which of the following is a stronger base: \(\mathrm{NH}_{3}\) or \(\mathrm{PH}_{3}\) ? (Hint: The \(\mathrm{N}-\mathrm{H}\) bond is stronger than the \(\mathrm{P}-\mathrm{H}\) bond. \()\)
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Complete this table for a solution: $$\begin{array}{c|c|c}\mathrm{pH} & {\left[\mathrm{H}^{+}\right]} & \text {Solution is } \\\\\hline<7 & & \\\\\hline & <1.0 \times 10^{-7} M & \\\\\hline & & \text { Neutral }\end{array}$$
A 1.294 -g sample of a metal carbonate \(\left(\mathrm{MCO}_{3}\right)\) is reacted with \(500 \mathrm{~mL}\) of a \(0.100 \mathrm{M} \mathrm{HCl}\) solution. The excess \(\mathrm{HCl}\) acid is then neutralized by \(32.80 \mathrm{~mL}\) of \(0.588 M \mathrm{NaOH} .\) Identify M.
Predict whether a solution containing the salt \(\mathrm{K}_{2} \mathrm{HPO}_{4}\) will be acidic, neutral, or basic. (Hint: You need to consider both the ionization and hydrolysis of \(\mathrm{HPO}_{4}^{2-} .\)
How many milliliters of a strong monoprotic acid solution at \(\mathrm{pH}=4.12\) must be added to \(528 \mathrm{~mL}\) of the same acid solution at \(\mathrm{pH}=5.76\) to change its \(\mathrm{pH}\) to \(5.34 ?\) Assume that the volumes are additive.
Predict the \(\mathrm{pH}(>7,<7, \approx 7)\) of a \(\mathrm{NaHCO}_{3}\) solution.
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