## WCB QUIZ

SOLUTION CONCENTRATION AND STOICHIOMETRY

1. How much NaOH is needed to make 500 mL of a 2.5 % (w/v) solution?

a. 2.5 g

b. 5.0 g

c. 500 g

d. 12.5 g

2. How much NaCl is present in 25 mL of a 12% (w/v) solution?

a. 3 g

b. 4 g

c. 6 g

d. 12 g

3. How many mL of a 5% (w/v) solution will be needed to provide 20 g of glucose?

a. 100 mL

b. 20 mL

c. 4 mL

d. 400 mL

4. How many mL of 0.250 M H2SO4 are required to react completely with 25.0 mL of 1.500 M NaOH?

a. 150. mL

b. 50.0 mL

c. 300. mL

d. 75.0 mL

5. A 20.0 g sample of HF is dissolved in water to give 2.0 x 102 mL of solution. The concentration of the solution is:

a. 1.0 M

b. 3.0 M

c. 0.10 M

d. 5.0 M

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• 6. 1.00 mL of a 4 M NaCl is diluted to a volume of 10.0 mL. Then 5 mL of the resulting solution is diluted to a total volume of 10 mL. What is the concentration of NaCl in the final solution.?

a. 0.4 M

b. 0.2 M

c. 0. 1 M

d. 0.02 M

7. How many grams of NaCl are contained in 350. mL of 0.250 M solution of sodium chloride?

a. 41.7 g

b. 5.11 g

c. 14.6 g

d. 87.5 g

8. What volume of 18.0 M sulfuric acid is required to prepare 16.5 l of 0.126 M H2SO4?

a. 11.6 mL

b. 0.116 L

c. 232 mL

d. 0.264 L

9. How many grams of solute are contained in 141 mL of a 0.175 M silver nitrate solution?

a. 6.85 g

b. 3.80 g

c. 0.145 g

d. 4.19 g

10. For which one of the following acid solutions will 50.0 mL neutralize 50.0 mL of a 0.2 M Ba(OH)2 solution?

a. 0.1 M HCl

b. 0.2 M HNO3

c. 0.3M HCl

d. 0.2 M H2SO4

11. Calculate the concentration of a sodioum hydroxide solutions, 23.09 mL of which reacts exactly with 16.95 mL of 0.156 M hydrochloric acid.

a. 0.228 M

b. 0.0573 M

c. 0.115 M

d. 0.212 M

12. 50.0 mL of 0.10 M silver nitrate is added to 50.0 mL of 0.20 M calcium chloride. A white precipitate forms. After the reaction is complete, calculate the amount of precipitate that formed. (Hard problem)

a.28.7 g

b. 14.3 g

c. 1.05 g

d. 0.717 g