2. the Hydrogen Bonding That Occurs in Water Accounts for Water S

1. What is the molarity of a solution prepared with 10.0 g NaCl, and diluted with water to a final solution volume of 286 mL?

(A) 2.12 M

(B) 0.36 M

(D) 0.60 M

2. The hydrogen bonding that occurs in water accounts for water’s

(A) low vapor pressure

(B) low specific heat capacity

(D) all of the above

3. What is the molality of a solution prepared with 10.0 g NaCl and 255 g of water?

(A) 0.67 m

(B) 1.20 m

(D) Cannot be determined

4. What is the mole fraction of water in a solution prepared from 10.0 g NaCl and 255 g of water?

(A) 0.012

(B) 0.988

(D) None of the above

5. What is the mass percent of NaCl in a solution prepared from 10.0 g NaCl and 255 g of water?

(A) 2.1 %

(B) 10 %

(D) 3.9%

6. When half of the water in a 1.0 m solution of sucrose is boiled off, what happens to the concentration of sucrose?

(A) Doubles

(B) Increases but does not double

(D) None of the above

7. When the half of the water in a 1.0 M solution of sucrose is boiled off, what happens to the concentration of sucrose?

(A) Doubles

(B) Increases but does not double

(D) None of the above

8. Which of the following observations indicates that the mixture you possess is not a solution?

(A) It is colored.

(B) It has a taste different than the solvent.

(D) It conducts electricity.

9. Why does a bottle of soda "fizz" when it is first opened?

(A) The sudden release of pressure upon opening reduces the solubility of carbon dioxide in the soda, causing the carbon dioxide to come out of solution.

(B) The shaking of the bottle from transport causes the fizzing.

(C) The soda companies insert a microchip into the bottom of the can that releases a gas when the bottle is first opened to tell you that it is fresh.

(D) None of the above

10. What would happen to the solubility of a gas in water if the volume of the water were decreased but the volume of the gas remained constant?

(A) Decreases

(B) Nothing

(D) Triples

11. Which of the following does not increase its solubility in water with increasing temperature?

(A) Hydrogen

(B) NaCl

(D) Sucrose

12. Which of the following will increase the solubility of Na2SO4 in water?

(A) Increase solvent volume

(B) Increased temperature

(D) Increased pressure

13. When power plants release water that was boiled to turn steam engines, fish throughout the area die of asphyxiation. Which of the following best explain why that is so?

(A) The hot water released into the body of water has much dissolved carbon dioxide due to its high temperature.

(B) Due to the high density of the warm water, it causes all the fish to sink so that they cannot reach the surface where they breathe.

(D) None of the above

14. Which of the following will form a solution together?

(A) Oil and vinegar

(B) Water and vinegar

(D) None of the above

15. Which of the following is not a colligative property?

(A) Boiling point elevation

(B) Freezing point depression

(D) Surface tension lowering

, the solute must be a volatile one.

16. The normal freezing point of benzene is 5.5oC. If a solution of 0.0996 moles of sucrose in 1500 g of benzene freezes at 5.16oC, what is the molal freezing point depression constant, Kf?

(A) 5.16oC kg / mol

(B) 2.22oC kg / mol

(D) 5.12oC kg / mol

17. Which of the following is not true about freezing points?

(A) They are a property only of the pure solvent and, therefore, cannot be changed.

(B) They can be increased by the addition of a non-volatile solute.

(D) The can be increased by the addition of a volatile solute.

18. What is the freezing point depression for a 1.0 m solution of glucose in camphor? The value of Kf for camphor is 40 oC kg / mol.

(A) 43 oC

(B) 40 oC

(D) 34oC

19. What is the boiling point of a 1.2 m aqueous solution of a nonelectrolyte? The Kb of water is 0.51oC kg / mol.

(A) 100.6oC

(B) 99.4oC

(D) None of the above

OPEN ENDED

1. Find the boiling point of an aqueous solution containing a nonelectrolyte that freezes at -6.52oC.

101.83oC = 102oC (sig figs)

2. Sodium metal reacts violently with water to form NaOH and release hydrogen gas. Suppose that 10.0 g of Na react completely with 1.00 L of solution. What is the molarity of the NaOH solution formed by the reaction?

2 Na + 2 H2O > 2 NaOH + H2

0.434 mol ------à 0.434 mol

0.434 mol/ 1.00 L solution = 0.434 M

3. Write the dissociation equation for barium nitrate in water. If you put 0.386 moles of barium nitrate into .500L of water, what will the concentration of nitrate ions be?

Ba(NO3)2 (s) à Ba 2+ (aq) + 2 NO3 – (aq)

0.368 moles ------à .772 moles

.772 moles/0.500 = 1.54 M

4. You mix 489 mL of 2.00 M sodium chloride and 650.0 mL of 0.530 M silver nitrate.

a. Write a balanced equation for this reaction and circle the precipitate.

NaCl (aq) + AgNO3 (aq) à AgCl (s) + NaNO3 (aq)

.978 mol .345 mol (LR)

b. How many grams of ppt: 49.5 grams of AgCl