http://www.ck12.org Chapter 16. Solutions
- Calculate the boiling point and freezing point of a 1.0 molal NaCl solution.
- Calculate the boiling point and freezing point of a 1.0 molal aluminum chloride solution. Compare these
values to the boiling and freezing points determined for the 1.0 molal NaCl solution in the previous question.
Explain any differences. - We want to prepare a solution in which the mole fraction of NaCl is 0.20. If the solution contains 80 grams of
NaCl, how many grams of water are required? - Calculate the mole fractions of both the solute and the solvent in a saturated solution of hydrogen sulfide in
water at 20°C and 1 atm. Use the temperature-solubility curve in theFigure16.15 to determine the solubility
of H 2 S.
FIGURE 16.15
Solubility-temperature relationship for
H 2 S- How many grams of ethylene glycol (HOCH 2 CH 2 OH) must be added to 5.50 kg of water to lower the freezing
point of the water from 0.0°C to -10.0°C? (This is approximately what happens when you put antifreeze in
your car.) - Vitamin K is involved in the mechanism by which blood clots. When 5.00 g of vitamin K is dissolved in 100.0
g of camphor, the freezing point is lowered by 4.43°C. Calculate the molar mass of vitamin K. Kffor camphor
is 37.7°C/m, and vitamin K is a molecular substance that does not dissociate into ions.
Further Reading / Supplemental Links
- Freezing-point depression animation: http://group.chem.iastate.edu/Greenbowe/sections/projectfolder/anima
tionsindex.htm - Boiling-point elevation animation: http://group.chem.iastate.edu/Greenbowe/sections/projectfolder/animation
sindex.htm