Practice: Conjugate Acid

Name: __________________________________
Period: _______
Practice: Conjugate Acid-Base Pairs
Date: __________________________________
1. Identify the acid, base, conjugate acid and conjugate base for each of the following.
a) HClO 4 (aq) + H 2 O(l) ⇌ H 3 O+(aq) + ClO 4 –(aq)
b) H 2 SO 3 (aq) + H 2 O(l) ⇌ H 3 O+(aq) + HSO 3 –(aq)
c) HC 2 H 3 O 2 (aq) + H 2 O(l) ⇌ H 3 O+(aq) + C 2 H 3 O 2 –(aq)
d) H 2 S(g) + H 2 O(l) ⇌ H 3 O+(aq) + HS–(aq)
e) HSO 3 –(aq) + H 2 O(l) ⇌ H 3 O+(aq) + SO 3 2–(aq)
f) NH 3 (g) + H 2 O(l) ⇌ NH 4 +(aq) + OH–(aq)
g) HF(aq) + HSO 3 –(aq) ⇌ F–(aq) + H 2 SO 3 (aq)
h) HNO 2 (aq) + HS–(aq) ⇌ NO 2 –(aq) + H 2 S(aq)
2. Complete the equation for the reaction of each of the following with water. Then:
i.
Indicate whether the ion or molecule is an acid or base; and,
ii.
Indicate whether each reaction is explained by Arrhenius, Brønsted-Lowry, or both.
a) HI(aq) + H 2 O(l) ⇌
b) HF(aq) + H 2 O(l) ⇌
c) C 2 H 3 O 2 –(aq) + H 2 O(l) ⇌
d) CO 3 2–(aq) + H 2 O(l) ⇌
e) O2–(aq) + H 2 O(l) ⇌
Name: __________________________________
Date: __________________________________
Period: _______
Answer Key
a.
HClO 4 (aq)
+ H 2 O(l)
H 2 SO 3 (aq)
+ H 2 O(l)
b.
c.
d.
e.
f.
g.
h.
2.
acid
acid
HC 2 H 3 O 2 (aq)
acid
conj. acid
+ H 2 O(l)
base
+ H 2 O(l)
NH 3 (g)
+ H 2 O(l)
HF(aq)
+ HSO 3 –(aq)
HNO 2 (aq)
+ HS–(aq)
acid
acid
+ HSO 3 –(aq)
base
HSO 3 –(aq)
base
H 3 O+(aq)
conj. acid
+ H 2 O(l)
acid
+ ClO 4 –(aq)
base
H 2 S(g)
acid
H 3 O+(aq)
H 3 O+(aq)
conj. acid
H 3 O+(aq)
base
conj. acid
base
conj. acid
acid
conj. acid
conj. base
conj. base
+ C 2 H 3 O 2 –(aq)
conj. base
+ HS–(aq)
conj. base
H 3 O+(aq)
+ SO 3 2–(aq)
NH 4 +(aq)
+ OH–(aq)
F–(aq)
+ H 2 SO 3 (aq)
NO 2 –(aq)
+ H 2 S(aq)
base
conj. base
base
conj. base
a. HI(aq) + H 2 O(l) ⇄ I–(aq) + H 3 O+(aq)
Bronsted-Lowry and Arrhenius acid
b. HF(aq) + H 2 O(l) ⇄ F–(aq) + H 3 O+(aq)
Bronsted-Lowry and Arrhenius acid
c. C 2 H 3 O 2 –(aq) + H 2 O(l) ⇄ HC 2 H 3 O 2 (aq) + OH–(aq)
Bronsted-Lowry base only
d. CO 3 2–(aq) + H 2 O(l) ⇄ HCO 3 –(aq) + OH–(aq)
Bronsted-Lowry base only
e. O2–(aq) + H 2 O(l) ⇄ 2OH–(aq)
Bronsted-Lowry base only
conj. base
conj. base
conj. acid
conj. acid