Description
ANES 500
Chapter 8 Assignment
Name: __________________ Due 11:30 pm on 11/01/2021
Fall 2021_2022
Grade__________
General Instructions
Provide suitable responses for the problems shown below. The assignment is to be completed
individually and returned by 11:30 pm EDT on Monday, November 1, 2021. Where applicable,
show your work to receive full credit. Late assignments will be assessed a penalty of 10 % of the
overall grade per day late.
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ANES 500
Chapter 8 Assignment
Name: __________________ Due 11:30 pm on 11/01/2021
Fall 2021_2022
Grade__________
1. Consider the contents of Flasks I – IV when answering questions 2(a) to 2(e). Flask I contains
a glucose solution. Flasks II and III contain pure water. Flask IV contains a red blood cell
suspended in a saline solution of unknown concentration. (5 Pts)
(a) If Flask I and Flask II were heated equally, which liquid will boil first?
(b) If Flask I and Flask II were heated to 50 oC, which flask, if any, would have the lower
vapor pressure?
(c) If Flask I and Flask III were placed in a freezer, which liquid will freeze first?
(d) If the temperature in Flask I is 10 oC higher than in Flask III, which flask will have the
higher vapor pressure?
(e) Is the solution in Flask IV isotonic, hypertonic, or hypotonic? The arrows indicate the net
movement of water.
2. Decide whether the following statements are true (T) or false (F): (6 pts)
(a) Colligative properties depend on the number of molecules present, not on the kind of
molecules used.
(b) Under identical conditions, the vapor pressure of a solution is expected to be higher than
that of the pure solvent from which it is made.
(c) Adding a nonvolatile solute to a pure solvent will decrease its freezing point.
(d) Adding a nonvolatile solute to a pure solvent will increase its vapor pressure.
(e) Adding a nonvolatile solute to a pure solvent will increase its boiling point.
(f) Osmotic pressure is not a colligative property and has no dependence on solute
concentration.
3. The allowable concentration of lead in drinking water is 0.0015 mg per 100 grams. (a) What
is this concentration in parts per million (ppm)? (b) What is this concentration in parts per
billion (ppb)? (c) In some countries, the allowable concentration of manganese in water is
0.0500 ppm. What is this concentration in mg per 100 grams? (6 pts)
4. A solution is prepared by dissolving 1.25 gram of KCl in enough water to give 275 mL of
solution. (a) How many moles of KCl are in the solution? (b) How many millimoles of KCl
are in the solution? (c) What is the molarity of the solution? Show your work and report your
answers to 3 significant figures. (6 pts)
5. Calculate the percent concentration (w/v) of KCl in the previous problem. Show your work
and report your answers to 3 significant figures. (4 pts)
6. How many grams of glucose are there in 775 milliliters of a 15% (w/v) glucose solution?
Show your work and report your answers to 3 significant figures. (4 pts)
7. A reaction calls for 0.311 mole of glucose. (a) Calculate the mass of glucose that is required
for this reaction. (b) If the available glucose solution has a molarity of 2.50 mole/liter (2.50
Molar), how many milliliters of this solution will be needed to supply the 0.311 mole of
glucose? Show your work and report your answers to 3 significant figures. (6 pts)
7. A solution contains 0.130 mole CaCl2, 0.275 mole of NaCl, and 0.250 mole of MgCl2, how
many mEq of each ion are in the solution? Show your work and report your answers to 3
significant figures. (6 pts)
8. A solution is prepared by dissolving 5.50 grams of MgCl2 in enough water to give 375 mL of
solution. Calculate (a) the molarity and (b) the normality of the solution. Show your work
and report your answers to 3 significant figures. (6 pts)
9. How many grams of KCl are needed to prepare 255 mL of a 1.13 % KCl solution (w/v)?
Show your work and report your answers to 3 significant figures. (4 pts)
10. A solution contains 0.25% (w/v) Xanax. (a) What is its concentration in mg/cc? How many
milligrams of Xanax can be obtained from 3.00 cc of this solution? Show your work and
report your answers to 2 significant figures. (5 pts)
11. (a) A solution is labeled 1:90,000. (a) Determine the dosage equivalence in mg/cc. (b) What
is the dosage equivalence in percent concentration? (c) How many milligrams of the
medication are in 10.0 cc of this solution? Show your work and report your answers to 3
significant figures. (6 pts)
12. Calculate the molality of a KCl solution that contains 5.52 grams of KCl in a total of 112
grams of solution. Show your work and report your answer to 3 significant figures. (5 pts)
13. Calculate solubility of CO2 in water at 25.0 oC if its partial pressure is 3.20 atm. Assume kH
for CO2 is 3.10 x 10-2 mole/(L.atm). Show your work and report your answer to 3 significant
figures. (5 pts)
14. A solution is prepared by dissolving 21.5 grams of glucose to a total volume of 0.250 L. (a)
What is the molarity of the solution? (b) If the temperature of the solution is 25.0 oC, what is
its osmotic pressure? π = MRT. R = 0.08206 L.atm/K.mole. Show your work and report
your answers to 3 significant figures. (5 pts)
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