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Chapter 5: Problem 51
How many milliliters of 2.155 M KOH are required to titrate \(25.00 \mathrm{mL}\) of \(0.3057 \mathrm{M} \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COOH}\) (prop-ionic acid)?
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Determine the concentration of the ion indicated in each solution. (a) \(\left[\mathrm{K}^{+}\right]\) in \(0.238 \mathrm{M} \mathrm{KNO}_{3} ;\) (b) \(\left[\mathrm{NO}_{3}\right]\) in \(0.167 \mathrm{M} \mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2} ;(\mathrm{c})\left[\mathrm{Al}^{3+}\right]\) in \(0.083 \mathrm{M} \mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3};\) (d) \(\left[\mathrm{Na}^{+}\right]\) in \(0.209 \mathrm{M} \mathrm{Na}_{3} \mathrm{PO}_{4}\).
Which solutions would you use to precipitate \(\mathrm{Mg}^{2+}\) from an aqueous solution of \(\mathrm{MgCl}_{2} ?\) Explain your choice. (a) \(\mathrm{KNO}_{3}(\mathrm{aq}) ;\) (b) \(\mathrm{NH}_{3}(\mathrm{aq}) ;\) (c) \(\mathrm{H}_{2} \mathrm{SO}_{4}(\mathrm{aq});\) (d) \(\mathrm{HC}_{2} \mathrm{H}_{3} \mathrm{O}_{2}(\mathrm{aq})\).
Which solution has the greatest \(\left[\mathrm{SO}_{4}^{2-}\right]:\) (a) \(0.075 \mathrm{M}\) \(\mathrm{H}_{2} \mathrm{SO}_{4} ; \quad\) (b) \(\quad 0.22 \mathrm{M} \mathrm{MgSO}_{4} ; \quad\) (c) \(\quad 0.15 \mathrm{M} \mathrm{Na}_{2} \mathrm{SO}_{4}\) (d) \(0.080 \mathrm{M} \mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3} ;\) (e) \(0.20 \mathrm{M} \mathrm{CuSO}_{4} ?\)
The active ingredients in a particular antacid tablet are aluminum hydroxide, \(\mathrm{Al}(\mathrm{OH})_{3},\) and magnesium hydroxide, \(\mathrm{Mg}(\mathrm{OH})_{2} . \quad \mathrm{A} 5.00 \times 10^{2} \mathrm{mg}\) sample of the active ingredients was dissolved in \(50.0 \mathrm{mL}\) of \(0.500 \mathrm{M} \mathrm{HCl} .\) The resulting solution, which was still acidic, required \(16.5 \mathrm{mL}\) of \(0.377 \mathrm{M} \mathrm{NaOH}\) for neutralization. What are the mass percentages of \(\mathrm{Al}(\mathrm{OH})_{3}\) and \(\mathrm{Mg}(\mathrm{OH})_{2}\) in the sample?
When aqueous sodium carbonate, \(\mathrm{Na}_{2} \mathrm{CO}_{3}\), is treated with dilute hydrochloric acid, HCl, the products are sodium chloride, water, and carbon dioxide gas. What is the net ionic equation for this reaction?
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