Section 20.2-Brönsted-Lowry Theory of Acids & Bases
Hebden: Section 4-5 - Do Exercises p 119-121 #15-19
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1. The conjugate base of H2BO3– is 9601
A. BO3
B. H3BO3
C. HBO3
D.
H3BO3
2. Which of the following is amphiprotic in water? 9601
A. SO2
B. SO3
C. HSO3
D. H2SO3
3. Water acts as a base when it reacts with 9601
A. CN 
B. NH3
C. NO2 

4. Consider the following equilibrium: 9604
A. acid, base, acid, base.
B. acid, base, base, acid.
C. base, acid, acid, base.
D. base, acid, base, acid.
13. The equation representing the reaction of ethanoic acid with
water is 9701
D. NH4
14. The conjugate acid of C6H5Ois 9704
A. C6H4O
B. C6H5OH
C. C6H4O
The sequence of Brönsted-Lowry acids and bases in the above
equilibrium is
A. acid, base, base, acid.
B. acid, base, acid, base.
C. base, acid, base, acid.
D. base, acid, acid, base.
5. Which of the following is a conjugate acid-base pair? 9604
A. H3PO4 and PO43–
B. H2PO4and PO4

C. H3PO4 and HPO4
D. H2PO4and HPO4

6. Water will act as a Brönsted-Lowry acid with 9604
A. NH3
B. H2S
C. HCN
D. HNO3

7. Consider the following equilibrium: 9606
D. C6H5OH+
15. A Brönsted-Lowry base is defined as a chemical species
that 9706
A. accepts protons.
B. neutralizes acids.
C. donates electrons.
D. produces hydroxide ions in solution.
16. Consider the following equilibrium:

The order of Brönsted-Lowry acids and bases is
A. acid, base, acid, base B. acid, base, base, acid
C. base, acid, acid, base D. base, acid, base, acid
17. A base is converted to its conjugate acid by 9708
A. adding a proton.
B. adding an electron.
C. removing a proton.
D. removing an electron.
The Brönsted-Lowry acids and bases are, respectively,
A. acid, base, base, acid.
B. acid, base, acid, base.
C. base, acid, base, acid.
D. base, acid, acid, base.
18. Consider the following: 9708
8. An aqueous solution that contains more hydronium ions than
hydroxide ions is a(n) 9606
A. basic solution.
B. acidic solution.
C. neutral solution.
D. standardized solution.
9. Consider the following equilibrium: 9608

The NO2is acting as a
A. Brönsted-Lowry acid by donating a proton.
B. Brönsted-Lowry base by donating a proton.
C. Brönsted-Lowry acid by accepting a proton.
D. Brönsted-Lowry base by accepting a proton.
Which of the above are amphiprotic in an aqueous solution?
A. I and II only
B. II and III only
C. I, II and III only
D. II, III and IV only
19. In which of the following equilibrium systems is
HCO3acting as a Brönsted-Lowry base? 9801
10. The conjugate acid of H2PO4is 9608
A. PO4
B. H3PO4
C. HPO4
D. H3PO4

11. An amphiprotic substance can act as 9608
A. a base only. B. an acid only. C. both an acid and a base.
D. neither an acid nor a base.
12. Consider the following equilibrium: 9701

The order of Brönsted-Lowry acids and bases is
Section -Document1 p 1 o f 2
20. The conjugate acid of H2O is 9801
A. O 
B. OH 
C. H3O 
D. H2O2
21. Which of the following could act as a Brönsted-Lowry acid,
but not as a Brönsted-Lowry base? 9804
A. NH3(aq)
B. H2O(l) C. HClO4(aq) D. HCO3–(aq)
22. A substance which produces hydrogen ions in solution is the
definition of 9806
A. an Arrhenius acid.
B. an Arrhenius base.
C. a Brönsted-Lowry acid.
D. a Brönsted-Lowry base.
23. The number of conjugate pairs in a Brönsted-Lowry acid-base
equation is 9806
A. 1
B. 2
C. 3
D. 4
24. The conjugate acid of the monohydrogen phosphate ion,
HPO42– , is 9808
A. PO4
B. H2PO4
C. H2PO4
D. H2PO4

25. Which of the following are amphiprotic in aqueous solution?
9808
I - HBr
II - H2O
III- HCO3–
IV H2C6H5O7–
A. I and II only
B. III and IV only
C. II, III and IV only
D. I, II, III and IV
26. Consider the following acid-base equilibrium: 9901

32. Water will act as an acid with which of the following? 0001
I. H2CO3
II. HCO3–
III. CO32–
A. I only.
B. III only.
C. I and II only.
D. II and III only.
33. The conjugate base of H2PO4– is 0006
A. OH–
B. PO43–
C. H3PO4 D. HPO42–
MC:
12.C
22.A
32.D
1.C 2.C 3.D 4.A 5.D 6.A 7.A 8.B 9.D 10.B 11.C
13.C 14.B 15.A 16.C 17.A 18.B 19.C 20.C 21.C
23.B 24.B 25.C 26.C 27.B 28.D 29.B 30.A 31.D
33.D
PART B: Written Response:
1. a) Write the balanced equation representing the reaction of
HF with H2O. (1 mark) 9704
HF + H2O qwe F– + H3O+
b) Identify the Brönsted-Lowry bases in the above equation. (1
mark)
In the reaction above, the Brönsted-Lowry acids are
A. H2O and OH 
B. HCO3and OH
C. H2O and H2CO3
D. HCO3and H2CO3
27. Consider the following:
I- PO4 
II- HPO4
Identify the Brönsted-Lowry bases in this equilibrium. 9908
A. H2BO3and H3BO3
B. HC2O4and H3BO3



C. HC2O4 and C2O4
D. H2BO3and C2O4
F– , H2O
2. Define the term Brönsted-Lowry acid. (2 marks) 9801
III- H2PO4
IV- H3PO4
The term amphiprotic can be used to describe 9901
A. I only.
B. II and III only.
C. I, II and III only.
D. II, III and IV only.

28. The conjugate acid of HAsO4is 9904
A. H3O 
B. AsO4
C. H3AsO4
D. H2AsO4

29. Consider the following Brönsted-Lowry equilibrium system:
What are the two Brönsted-Lowry bases in the equilibrium
above? 9906

A. HSO3and SO3
B. H2PO4and SO3

C. HSO3 and H3PO4
D. H2PO4and H3PO4
30. Consider the following: 9906
A chemical species that is a
proton donor
3. a) Define the term Brönsted-Lowry base. (2 marks) 9804
A chemical species that is a
proton acceptor
b) Give an example of a compound that acts as a weak base. (1
mark)
F– NaF, NH3 etc
4. a) Define the term amphiprotic. (1 mark) 9806 0001
An ion or molecule that can
accept or donate a proton.
b) Give an example of an amphiprotic anion. (1 mark)
HSO3– , or H2PO4–, or HPO42–
The amphiprotic ions are
A. I and II only.
B. I and III only.
C. II and III only.
D. I, II, III.
31. Consider the acid-base equilibrium system:
Section -Document1 p 2 o f 2
20.2 MC:
1.C 2.C 3.D 4.A 5.D
6.A 7.A 8.B 9.D 10.B
11.C 12.C 13.C 14.B 15.A
16.C 17.A 18.B 19.C 20.C
21.C 22.A 23.B 24.B 25.C
26.C 27.B 28.D 29.B 30.A
31.D 32.D 33.D
Section -Document1 p 3 o f 2