CHEM 104 EXAM15 Exam Questions and Answers Verified Solutions Latest Update 2026/2027

CHEM 104 EXAM15 Exam Questions and
Answers Verified Solutions Latest Update
2026/2027


Question:
• Which ion will be basic in aqueous solution?
a. Br-
b. NO3-
c. HSO4-
d. SO32-

Answer:
d. SO32-
because SO32- is the conjugate base of a weak acid in an aqueous solution.


Question:
• Which pair is a Brønsted-Lowry conjugate acid-base pair?
a. NH3; NH4+
b. H3O+; OH-
c. HCl; HBr
d. ClO4-; ClO3-

Answer:
a. NH3; NH4+
• Consider the given acid ionization constants and identify the strongest conjugate base.


Question:
ACID: Ka: HNO2(aq). 4.6 x10-4 HCHO2(aq). 1.8 x10-4 HClO(aq). 2.9 X10-8 HCH(aq). 4.9
X10-10
a. NO2− (aq)
b. CHO2− (aq)
c. ClO− (aq)

,d. CN− (aq)

Answer:
d. CN- (aq)


Question:
• The weaker the acid the _______ the conjugate base

Answer:
stronger


Question:
10−9 M?
a. 1.9 × 10−9 M
b. 5.3 × 10−6 M
c. 1.9 × 105 M
d. 1.9 × 10−23 M

Answer:
b. 5.3 X10-6


Question:
(aq) solution?
a. 1.75 M
b. 5.6 x 10−13 M
c. 56 M
d. 0.018 M

Answer:
d. 0.018 M


Question:
10−5.
a. 4.64
b. 4.19

, c. 2.32
d. 11.68

Answer:
c. 2.32


Question:
a. 0.81
b. 1.44
c. 1.38
d. 1.33

Answer:
b. 1.44


Question:
acid, Ka = 1.8 × 10−5.
a. 0.35%
b. 0.0018%
c. 0.29%
d. 0.0051%

Answer:
a. 0.35%


Question:
M. Which statement about the two solutions is true?
a. Solution A has the higher percent ionization and the higher pH.
b. Solution B has the higher percent ionization and the higher pH.
c. Solution A has the higher percent ionization and solution B has the higher pH.
d. Solution B has the higher percent ionization and solution A has the higher pH.

Answer:
a. Solution A has higher percent ionization and the higher pH.
• What is the [OH−] of a 0.200 M solution of ethylamine (C2H5NH2)? For ethylamine,
Kb = 5.6 × 10−4.