91Ó°ÊÓ

In a laboratory experiment, a 15.0 -mL sample of \(\mathrm{KCl}\) solution is poured into an evaporating dish with a mass of \(24.10 \mathrm{~g}\). The combined mass of the evaporating dish and \(\mathrm{KCl}\) solution is \(41.50 \mathrm{~g} .\) After heating, the evaporating dish and dry \(\mathrm{KCl}\) have a combined mass of \(28.28 \mathrm{~g}\). (9.4) a. What is the mass percent (m/m) of the KCl solution? b. What is the molarity (M) of the KCl solution? c. If water is added to \(10.0 \mathrm{~mL}\) of the initial \(\mathrm{KCl}\) solution to give a final volume of \(60.0 \mathrm{~mL},\) what is the molarity of the diluted KCl solution?

Potassium fluoride has a solubility of \(92 \mathrm{~g}\) of \(\mathrm{KF}\) in \(100 . \mathrm{g}\) of \(\mathrm{H}_{2} \mathrm{O}\) at \(18^{\circ} \mathrm{C} .\) Determine if each of the following mixtures forms an unsaturated or saturated solution at \(18^{\circ} \mathrm{C}:(9.3)\) a. adding \(35 \mathrm{~g}\) of \(\mathrm{KF}\) to \(25 \mathrm{~g}\) of \(\mathrm{H}_{2} \mathrm{O}\) b. adding \(42 \mathrm{~g}\) of \(\mathrm{KF}\) to \(50 . \mathrm{g}\) of \(\mathrm{H}_{2} \mathrm{O}\) c. adding \(145 \mathrm{~g}\) of \(\mathrm{KF}\) to \(150 . \mathrm{g}\) of \(\mathrm{H}_{2} \mathrm{O}\)

Copper sulfate has a solubility of \(32 \mathrm{~g}\) of \(\mathrm{CuSO}_{4}\) in \(100 \mathrm{~g}\) of \(\mathrm{H}_{2} \mathrm{O}\) at \(20^{\circ} \mathrm{C} .\) Determine if each of the following mixtures forms an unsaturated or saturated solution at \(20^{\circ} \mathrm{C}:(9.3)\) a. adding \(57 \mathrm{~g}\) of \(\mathrm{CuSO}_{4}\) to \(100 . \mathrm{g}\) of \(\mathrm{H}_{2} \mathrm{O}\) b. adding \(24 \mathrm{~g}\) of \(\mathrm{CuSO}_{4}\) to \(80 \mathrm{~g}\) of \(\mathrm{H}_{2} \mathrm{O}\) c. adding \(83 \mathrm{~g}\) of \(\mathrm{CuSO}_{4}\) to \(150 \mathrm{~g}\) of \(\mathrm{H}_{2} \mathrm{O}\)

A solution is prepared with \(5.0 \mathrm{~g}\) of \(\mathrm{HCl}\) and \(195.0 \mathrm{~g}\) of \(\mathrm{H}_{2} \mathrm{O}\). The HCl solution has a density of \(1.49 \mathrm{~g} / \mathrm{mL}\). (9.4) a. What is the mass percent \((\mathrm{m} / \mathrm{m})\) of the \(\mathrm{HCl}\) solution? b. What is the total volume, in milliliters, of the solution? c. What is the mass/volume percent (m/v) of the solution? d. What is the molarity of the solution?

A solution is prepared by dissolving \(20 \mathrm{~g}\) of \(\mathrm{KCl}\) (MW \(74.55 \mathrm{~g}\) \(\mathrm{mol}^{-1}\) ) in \(100 \mathrm{~mL} 1 \mathrm{M} \mathrm{NaCl}\) solution. (9.4) a. What is the molar ratio of \(\mathrm{KCl}\) to \(\mathrm{NaCl} ?\) b. What is the concentration of chloride ion in the solution?