1. Principles & Modern Applications
General Chemistry
Principles & Modern Applications
9th Edition
Petrucci/Harwood/Herring/Madura
Chapter 5
Introductions to Reactions in Aqueous Solutions
Dr. Travis D. Fridgen
Memorial University of Newfoundland
© 2007 Pearson Education

2. Which of the following two solutions, when mixed, likely result in a precipitate?
1. NaCl(aq) + MgCl2(aq)
2. NH4Cl(aq) + NaBr(aq)
3. AgNO3(aq) + NaNO3(aq)
4. MgCl2(aq) + NaOH(aq)
5. Pb(NO3)2(aq) + AgOOCCH3(aq)

3. Which of the following two solutions, when mixed, likely result in a precipitate?
1. NaCl(aq) + MgCl2(aq)
2. NH4Cl(aq) + NaBr(aq)
3. AgNO3(aq) + NaNO3(aq)
4. MgCl2(aq) + NaOH(aq)
5. Pb(NO3)2(aq) + AgOOCCH3(aq)

4. Which of the following two compounds, when mixed together, do not form a precipitate?
1. NaBr(aq) + AgNO3(aq)
2. K2SO4(aq) + BaCl2(aq)
3. Mg(ClO4)2(aq) + NaOH(aq)
4. Na3PO4(aq) + NH4Cl(aq)
5. Pb(NO3)2(aq) + NaI(aq)

5. Which of the following two compounds, when mixed together, do not form a precipitate?
1. NaBr(aq) + AgNO3(aq)
2. K2SO4(aq) + BaCl2(aq)
3. Mg(ClO4)2(aq) + NaOH(aq)
4. Na3PO4(aq) + NH4Cl(aq)
5. Pb(NO3)2(aq) + NaI(aq)

6. The net ionic equation for the reaction that occurs when a solution of sodium iodide (NaI) is dripped into a solution of lead nitrate (Pb(NO3)2).

7. The net ionic equation for the reaction that occurs when a solution of sodium iodide (NaI) is dripped into a solution of lead nitrate (Pb(NO3)2).

8. While changing the battery in a car, a mechanic spills ~100 mL of sulfuric acid (H2SO4) on the floor. The sulfuric acid in a car battery is approximately 6 M. Baking soda or sodium bicarbonate (NaHCO3) can be used to neutralize the acid spill. If the mechanic has a 3 M solution of baking soda, what volume is required to neutralize the acid? (Do not use a calculator) mL mL mL mL mL

9. While changing the battery in a car, a mechanic spills ~100 mL of sulfuric acid (H2SO4) on the floor. The sulfuric acid in a car battery is approximately 6 M. Baking soda or sodium bicarbonate (NaHCO3) can be used to neutralize the acid spill. If the mechanic has a 3 M solution of baking soda, what volume is required to neutralize the acid? (Do not use a calculator) mL mL mL mL mL

10. In the pictures to the right, what are the probable contents in each of the beakers?
1. A) H2O(l), B) NH3(aq), C) NaOH(aq)
2. A) HCl(aq), B) H2O(l), C) CH3COOH(aq)
3. A) HCl(aq), B) NH3(aq), C) H2O(l) A B C
4. A) NaOH(aq), B) HCl(aq), C) H2O(l)
5. A) NH3(aq), B) CH3COOH(aq), C) HNO3(aq)

11. In the pictures to the right, what are the probable contents in each of the beakers?
1. A) H2O(l), B) NH3(aq), C) NaOH(aq)
2. A) HCl(aq), B) H2O(l), C) CH3COOH(aq)
3. A) HCl(aq), B) NH3(aq), C) H2O(l) A B C
4. A) NaOH(aq), B) HCl(aq), C) H2O(l)
5. A) NH3(aq), B) CH3COOH(aq), C) HNO3(aq)

12. The contents of the first beaker to the right is water which is a non-electrolyte. As you are aware the net ionic equation for the reaction of a strong base such as NaOH and a strong acid such as HCl is
True or false, the contents of the second beaker to the right could be 300 ml each of 2.0 M NaOH and 2.0 M HCl?
H2O
NaOH(aq) +
HCl?
1. True
2. False

13. The contents of the first beaker to the right is water which is a non-electrolyte. As you are aware the net ionic equation for the reaction of a strong base such as NaOH and a strong acid such as HCl is
True or false, the contents of the second beaker to the right could be 300 ml each of 2.0 M NaOH and 2.0 M HCl?
H2O
NaOH(aq) +
HCl?
1. True
2. False

14. The NaNO2 solution dissolves KMnO4 better, leaving no color.
Which of the following statements best explains the observations to the right?
KMnO4
The NaNO2 solution dissolves KMnO4 better, leaving no color.
The NO3- in the first solution oxidizes the MnO4- leaving a purple color.
The MnO4- oxidizes the NO2- in the second solution leaving no purple color.
The MnO4- reduces the NO2- in the second solution leaving no purple color.
NaNO3
NaNO2
5. The NO3- in the first solution reduces the MnO4- leaving a purple color.

15. The NaNO2 solution dissolves KMnO4 better, leaving no color.
Which of the following statements best explains the observations to the right?
KMnO4
The NaNO2 solution dissolves KMnO4 better, leaving no color.
The NO3- in the first solution oxidizes the MnO4- leaving a purple color.
The MnO4- oxidizes the NO2- in the second solution leaving no purple color.
The MnO4- reduces the NO2- in the second solution leaving no purple color.
NaNO3
NaNO2
5. The NO3- in the first solution reduces the MnO4- leaving a purple color.

16. 1. MnO4- is being oxidized to Mn2+
Which of the statements below is true about the following redox reaction occurring in aqueous solution.
KMnO4(aq)
1. MnO4- is being oxidized to Mn2+
Mn in MnO4- undergoes a change in oxidation state from -1 to +2.
O in MnO4- undergoes a change in oxidation state from -1 to -2.
Fe2+(aq)
4. H does not change its oxidation state.
5. Fe does not change its oxidation state.

17. 1. MnO4- is being oxidized to Mn2+
Which of the statements below is true about the following redox reaction occurring in aqueous solution.
KMnO4(aq)
1. MnO4- is being oxidized to Mn2+
Mn in MnO4- undergoes a change in oxidation state from -1 to +2.
O in MnO4- undergoes a change in oxidation state from -1 to -2.
Fe2+(aq)
4. H does not change its oxidation state.
5. Fe does not change its oxidation state.

18. Which of the following statements is false about the thermite reaction?
1. The chemical equation given above is balanced.
2. The oxidation state of Fe in Fe2O3 is +3.
3. The oxidation state of Al in Al2O3 is +2.
4. Fe in Fe2O3 is reduced to elemental iron.
5. The oxidation state of O remains unchanged.

19. Which of the following statements is false about the thermite reaction?
1. The chemical equation given above is balanced.
2. The oxidation state of Fe in Fe2O3 is +3.
3. The oxidation state of Al in Al2O3 is +2.
4. Fe in Fe2O3 is reduced to elemental iron.
5. The oxidation state of O remains unchanged.

20. In the presence of acid nitrate ion (NO3-) oxidizes solid copper to Cu2+. The by-product is gaseous NO2(brown). The balanced half reaction for NO3- reacting to form NO2 is

21. In the presence of acid nitrate ion (NO3-) oxidizes solid copper to Cu2+. The by-product is gaseous NO2(brown). The balanced half reaction for NO3- reacting to form NO2 is

22. 50 mL of solution containing Cl- is titrated to the endpoint with 10 mL of M AgNO3. What was the concentration of Cl- in the sample?
x10-3 M
x10-3 M
The titration of Cl- with AgNO3. The endpoint is reached when all of the Cl- has precipitated and the excess Ag+ reacts with the CrO42- indicator forming a brick-red precipitate.
x10-2 M
x10-2 M
x10-1 M

23. 50 mL of solution containing Cl- is titrated to the endpoint with 10 mL of M AgNO3. What was the concentration of Cl- in the sample?
x10-3 M
x10-3 M
The titration of Cl- with AgNO3. The endpoint is reached when all of the Cl- has precipitated and the excess Ag+ reacts with the CrO42- indicator forming a brick-red precipitate.
x10-2 M
x10-2 M
x10-1 M