Chem 104 Exam 15 Actual Test Paper Questions Correct Answers Graded A Plus

CHEM 104 EXAM 15 ACTUAL TEST PAPER QUESTIONS CORRECT ANSWERS GRADED A
PLUS
CHEM 104 Exam15 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+



Question:
Consider the given acid ionization constants and identify the strongest conjugate base. 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:

,What is the OH- concentration in an aqueous solution at 25 ºC in which [H3O+] = 1.9 × 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:
An HNO3 (aq) solution has a pH of 1.75. What is the molar concentration of the HNO3 (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:
Find the pH of a 0.350 M aqueous benzoic acid solution. For benzoic acid, Ka = 6.5 × 10-5. a. 4.64
b. 4.19 c. 2.32 d. 11.68

Answer:
c. 2.32



Question:
Find the pH of a 0.155 M HClO2 (aq) solution. For HClO2, Ka = 0.011. a. 0.81 b. 1.44 c. 1.38 d.
1.33

Answer:
b. 1.44



Question:
Calculate the percent ionization of 1.45 M aqueous acetic acid solution. For acetic acid, Ka = 1.8 ×
10-5. a. 0.35% b. 0.0018% c. 0.29% d. 0.0051%

Answer:
a. 0.35%

, Question:
Consider two aqueous solutions of nitrous acid (HNO2). Solution A has a concentration of [HNO2]
= 0.55 M, and solution B has a concentration of [HNO2] = 1.25 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.



Question:
What is the [OH-] of a 0.200 M solution of ethylamine (C2H5NH2)? For ethylamine, Kb = 5.6 ×
10-4. a. 0.00011 M b. 1.95 M c. 0.033 M d. 0.011 M

Answer:
d. 0.011 M



Question:
Which compound will form an acidic solution when dissolved in water? a. NH4Cl b. NaCl c. KNO2
d. Ca(NO3)2

Answer:
a. NH4Cl



Question:
Find the pH of 0.175 M NaCN solution. For HCN, Ka = 4.9 x 10-10. a. 5.03 b. 11.28 c. 2.72 d. 8.55

Answer:
b. 11.28



Question: