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Chapter 12: Problem 114
A solution of ethanol is prepared by combining \(22.5 \mathrm{~g}\) of ethanol with \(49.6 \mathrm{~g}\) of water. What is the percent composition by mass of alcohol in this solution?
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You have two solutions, one \(1.50 \mathrm{M}\) sodium sulfide and the other \(1.00 \mathrm{M} \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}\). (a) Write a net ionic equation for the precipitation reaction that occurs when these solutions are combined. (b) How many milliliters of the solutions must be combined to prepare \(10.00 \mathrm{~g}\) of precipitate? (c) Suppose you filter off the precipitate and find that your percent yield is \(50.0 \%\). What volumes of the solutions should you have combined to isolate \(10.00 \mathrm{~g}\) of precipitate?
Your assistant tells you he measured out \(116.886\) \(\mathrm{g}\) of \(\mathrm{NaCl}\) and then added exactly \(1.00 \mathrm{~L}\) of water to it to prepare a \(2.00 \mathrm{M}\) solution of \(\mathrm{NaCl}\). Do you fire him or give him a promotion? Explain.
When it is warmed, a piece of plastic changes from a solid phase in which its molecules are positioned in an ordered arrangement to a solid phase in which its molecules are arranged randomly. How could you determine the temperature at which this phase change occurs?
Which one of the following steps in the dissolving process must have a negative value for \(\Delta E\) ? Explain your answer. (a) The physical separation of solute particles (b) The formation of solvent-solute interactions (c) The physical separation of solvent particles (d) None of the above
A student dilutes \(75.0 \mathrm{~mL}\) of a \(2.00 \mathrm{M}\) solution of iron(III) nitrate with sufficient water to prepare \(2.00 \mathrm{~L}\) of solution. (a) What is the molar concentration of iron(III) nitrate in the diluted solution? Once in solution, the iron(III) nitrate exists not intact but rather as dissociated ions. What are the molar concentrations (b) of \(\mathrm{Fe}^{3+}(a q)\) in the diluted solution and (c) of \(\mathrm{NO}^{3-}(a q)\) in the diluted solution?
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