Problem 97
Which of the following aqueous solutions would you expect to be the best conductor of electricity at \(25^{\circ} \mathrm{C} ?\) Explain your answer. a) \(0.20 \mathrm{M} \mathrm{NaCl}\) b) \(0.60 \mathrm{M} \mathrm{HC}_{2} \mathrm{H}_{3} \mathrm{O}_{2}\) c) \(0.25 \mathrm{M} \mathrm{HCl}\) d) \(0.20 \mathrm{M} \mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2}\)
Problem 98
A \(5.00 \times 10^{2} \mathrm{~mL}\) sample of \(2.00 \mathrm{M} \mathrm{HCl}\) solution is treated with \(4.47 \mathrm{~g}\) of magnesium. Calculate the concentration of the acid solution after all the metal has reacted. Assume that the volume remains unchanged.
Problem 99
Calculate the volume of a \(0.156 \mathrm{M} \mathrm{CuSO}_{4}\) solution that would react with \(7.89 \mathrm{~g}\) of zinc.
Problem 100
Sodium carbonate \(\left(\mathrm{Na}_{2} \mathrm{CO}_{3}\right)\) is available in very pure form and can be used to standardize acid solutions. What is the molarity of an \(\mathrm{HCl}\) solution if \(28.3 \mathrm{~mL}\) of the solution is required to react with \(0.256 \mathrm{~g}\) of \(\mathrm{Na}_{2} \mathrm{CO}_{3} ?\)
Problem 101
Identify each of the following compounds as a nonelectrolyte, a weak electrolyte, or a strong electrolyte: (a) ethanolamine \(\left(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{ONH}_{2}\right),(\mathrm{b})\) potassium fluoride (KF), (c) ammonium nitrate ( \(\mathrm{NH}_{4} \mathrm{NO}_{3}\) ), (d) isopropanol \(\left(\mathrm{C}_{3} \mathrm{H}_{7} \mathrm{OH}\right)\)
Problem 102
Identify each of the following compounds as a nonelectrolyte, a weak electrolyte, or a strong electrolyte: (a) lactose \(\left(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\right),(\mathrm{b})\) lactic acid \(\left(\mathrm{HC}_{3} \mathrm{H}_{5} \mathrm{O}_{3}\right),\) (c) dimethylamine \(\left[\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}\right]\), (d) barium hydroxide \(\left[\mathrm{Ba}(\mathrm{OH})_{2}\right]\)
Problem 105
A \(3.664-\mathrm{g}\) sample of a monoprotic acid was dissolved in water. It took \(20.27 \mathrm{~mL}\) of a \(0.1578 \mathrm{M} \mathrm{NaOH}\) solution to neutralize the acid. Calculate the molar mass of the acid.
Problem 106
A quantitative definition of solubility is the number of grams of a solute that will dissolve in a given volume of water at a particular temperature. Describe an experiment that would enable you to determine the solubility of a soluble compound.
Problem 107
A \(15.00-\mathrm{mL}\) solution of potassium nitrate \(\left(\mathrm{KNO}_{3}\right)\) was diluted to \(125.0 \mathrm{~mL},\) and \(25.00 \mathrm{~mL}\) of this solution was then diluted to \(1.000 \times 10^{3} \mathrm{~mL}\). The concentration of the final solution is \(0.00383 \mathrm{M}\). Calculate the concentration of the original solution.
Problem 109
Calculate the mass of the precipitate formed when \(2.27 \mathrm{~L}\) of \(0.0820 \mathrm{M} \mathrm{Ba}(\mathrm{OH})_{2}\) is mixed with \(3.06 \mathrm{~L}\) of \(0.0664 \mathrm{M}\) \(\mathrm{Na}_{2} \mathrm{SO}_{4}\)
