CHE 1400 - Spring 2015 - Chapter 7
Homework 7
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) According to Arrhenius, an acid and a base will react to give
A) a solid. B) an acidic solution.
C) a salt plus water. D) a basic solution.
1)
2) A mixture of a weak acid and its conjugate base forms a(n)
A) antacid. B) buffer.
C) acid-base indicator. D) acid rain.
2)
3) Phosphoric acid is added to many popular beverages to give them a tart flavor.
The formula of phosphoric acid is
A) H3PO4. B) H4PO3. C) H2PO4. D) HPO4.
3)
4) HCN is classified as a weak acid in water. This means that it produces
A) a relatively small fraction of the maximum number of possible hydronium ions.
B) no hydronium ions.
C) 100% of the maximum number of possible hydronium ions.
D) a relatively large fraction of the maximum number of possible hydronium ions.
4)
5) The same number of moles of acetic acid and hydrogen chloride are placed in beakers containing water. After this addition, the beaker with the HCl has more hydronium ions than the beaker with added acetic acid. HCl is classified as
A) a weaker acid than acetic acid.
B) a stronger acid than acetic acid.
C) a base.
D) equal in acid strength to acetic acid.
5)
6) Nitric acid, HNO3, is classified as a strong acid in water. This means that it produces
A) a relatively small fraction of the maximum number of possible hydronium ions.
B) 100% of the maximum number of possible hydronium ions.
C) no hydronium ions.
D) a relatively large fraction of the maximum number of possible hydronium ions.
6)
7) A buffer
A) is made up of a weak acid and its conjugate base.
B) resists changes in pH when small amounts of a strong acid or a strong base are added.
C) is made up of a weak base and its conjugate acid.
D) All of the above are true.
7)
8) A conjugate acid-base pair differ by one
A) pH unit. B) H atom. C) O atom. D) proton.
8)
9) Phenolphthalein has often been used to monitor the progress of an acid-base neutralization reaction. What color will phenolphthalein be when there is an excess of acid present?
A) pink B) colorless C) yellow D) green
9)
10) The pH of rain collected on a remote island in the Pacific is assumed to be unaffected by human pollution. The pH of the rainwater will be
A) greater than 7. B) less than 7.
C) equal to 7. D) 0.
10)
11) Foods that are acidic can be identified by their ________ taste.
A) bitter B) sweet C) salty D) sour
11)
12) When added to water, which of the following would produce a base?
A) SO3 B) Cl2 C) CO2 D) Na2O
12)
13) If the concentration of a dilute solution of nitric acid is 0.0001 M, what is the pH of that solution?
A) 4 B) 5 C) 7 D) 14
13)
14) Which of the following is/are characteristic(s) of bases?
A) produce hydroxide ions when added to water B) reacts with acids to form salts
C) taste bitter
D) All are characteristics of bases.
14)
15) When nonmetal oxides react with water the resulting solution is ________.
A) basic B) neutral C) acidic D) salty
15)
16) When HCl is added to pure water, HCl molecules lose protons, while water molecules gain protons. In this reaction, HCl is a(n)
A) base. B) solvent. C) salt. D) acid.
16)
17) An acid is strong if it
A) makes acid-base indicators change color.
B) ionizes completely in water.
C) causes metals to corrode.
D) is very concentrated.
17)
18) H3O+ is the
A) hydroxide ion. B) hydrogen ion.
C) hydrate ion. D) hydronium ion.
18)
19) The compound CH3NH2 reacts with water to form CH3NH3+ and OH-. In this reaction, CH3NH2 is acting as a(n)
A) acid. B) base. C) salt. D) catalyst.
19)
20) Citric acid is made by oranges. When citric acid dissolves in water, it produces a relatively small number of hydronium ions. Citric acid is best described as a
A) strong acid. B) weak acid.
C) concentrated acid. D) dilute acid.
20)
21) Which of the following is NOT true of the Arrhenius theory?
A) Acids are defined as compounds that produce H+ ions in water solution.
B) Arrhenius theory only applies to reactions in aqueous solution.
C) Acids are defined as compounds that produce OH- ions in water solution.
D) Bases are defined as compounds that produce OH- ions in water solution.
21)
22) When added to water, which of the following would produce an acid?
A) Na2O B) CO2 C) Mg D) NH3
22)
23) An unknown substance is added to a solution and the pH decreases. The substance is best described as a(n)
A) salt. B) base. C) acid. D) solvent.
23)
24) Which of the following is characteristic of a base?
A) Bases turn litmus red.
B) Bases feel slippery.
C) Bases have a sour taste.
D) None of these is characteristic of a base.
24)
25) In the balanced chemical reaction for the neutralization of sodium hydroxide with sulfuric acid, H2SO4, the coefficient of sodium hydroxide is
A) 1. B) 2. C) 3. D) 4.
25)
26) Nitrous acid, HNO2, is classified as a weak acid in water. This means that it produces
A) a relatively large fraction of the maximum number of possible hydronium ions.
B) a relatively small fraction of the maximum number of possible hydronium ions.
C) 100% of the maximum number of possible hydronium ions.
D) no hydronium ions.
26)
27) Which of the following is an example of a nonmetal oxide?
A) CO2 B) NaOH C) K2O D) H2SO4
27)
28) The pH of a sample of water from a river is 6.0. A sample of effluent from a food processing plant has a pH of 4.0. The concentration of hydronium ion in the effluent is
A) four times (4x) larger than the river hydronium ion concentration.
B) two times (2x) larger than the river hydronium ion concentration.
C) 100 times (100x) larger than the river hydronium ion concentration.
D) one and a half times (1.5x) larger than the river hydronium ion concentration.
28)
29) A solution of toilet bowl cleaner has a pH of 1.0 The solution is
A) strongly basic. B) weakly acidic.
C) strongly acidic. D) weakly basic.
29)
30) Which of the following does NOT contribute to acid rain?
A) coal-burning power plants B) volcanic eruptions
C) lightning
D) All of the above contribute to acid rain.
30)
31) What is the conjugate base of HSO3-?
A) SO32- B) HSO4- C) H2SO3 D) H2SO4
31)
32) What is produced in an acid-base neutralization reaction?
A) an acid B) an acid and water
C) a base D) a salt and water
32)
33) Lemon juice has a sour taste and turns litmus to red. Lemon juice is
A) neutral. B) caustic. C) basic. D) acidic.
33)
34) What is the conjugate acid of HSO3-?
A) HSO4- B) SO32- C) H2SO3 D) H2SO4
34)
35) Hard water deposits (calcium carbonate) have built up around your bathroom sink. Which one of the following would be best to dissolve the deposit?
A) bleach B) lye C) ammonia D) vinegar
35)
Answer Key
Testname: CHAPRTER 7
1)
C
2)
B
3)
A
4)
A
5)
B
6)
B
7)
D
8)
D
9)
B
10)
B
11)
D
12)
D
13)
A
14)
D
15)
C
16)
D
17)
B
18)
D
19)
B
20)
B
21)
C
22)
B
23)
C
24)
B
25)
B
26)
B
27)
A
28)
C
29)
C
30)
D
31)
A
32)
D
33)
D
34)
C
35)
