Chem 065 - Introductory General Chemistry » Winter 2024 » Practice pH, pOH and Titration
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Question #1
A 25.0 mL sample of 0.105 M HCl was titrated with 31.5 mL of NaOH. What is the concentration of the NaOH?
A.
0.105 M
B.
0.0833 M
C.
none of these
D.
0.132 M
E.
0.075 M
Question #2
A 35.0 mL sample of 0.225 M HBr was titrated with 42.3 mL of KOH. What is the concentration of the KOH?
A.
none of these
B.
0.157 M
C.
0.272 M
D.
0.186 M
E.
0.303 M
Question #3
Exactly 17.0 mL of a H2SO4 solution was required to neutralize 45.0 mL of 0.235 M NaOH. What was the concentration of the H2SO4 solution? Given: H2SO4 (aq) + 2NaOH (aq) → 2H2O (l) + Na2SO4 (aq)
A.
0.311 M
B.
0.622 M
C.
5.63 M
D.
0.00529 M
E.
none of these
Question #4
In which solution is the [H3O+] less than 0.250 M?
A.
0.250 M HF (aq)
B.
all of these
C.
0.250 M HC2H3O2 (aq)
D.
0.250 M HCO2 (aq)
E.
none of these
Question #5
A 0.10 M solution of an electrolyte has a pH of 4.5. The electrolyte is:
A.
a weak acid.
B.
a strong acid.
C.
a weak base.
D.
none of these
E.
a strong base.
Question #6
What is the concentration of H⁺ in 2.0 M acetic acid, HC2H3O2?
A.
2.0 M
B.
< 2.0 M
C.
none of these
D.
1.0 M
E.
>2.0 M
Question #7
What is the concentration of H⁺ in 0.50 M hydroiodic acid?
A.
1.50 M
B.
1.0 M
C.
<0.50 M
D.
none of these
E.
0.50 M
Question #8
Ammonia (NH3) ionizes in water to form a basic solution. What is the concentration of OH- ions in a 0.75 M NH3 solution?
A.
< 0.75 M
B.
No OH- ions exist in a solution of NH3.
C.
> 0.75 M
D.
none of these
E.
0.75 M
Question #9
Consider a 1.6 × 10-3 M solution of HNO3. Which of the following statements is NOT true?
A.
This solution has a pH of 11.20.
B.
This solution could dissolve metal.
C.
none of these
D.
This solution could neutralize a base.
E.
This solution would turn litmus to red.
Question #10
What is the concentration of the hydroxide ion given that the concentration of the hydronium ion is 1.5 x (10) -5 M?
A.
none of these
B.
1.5 × 109 M
C.
1.0 × 10-14 M
D.
1.0 × 10-19 M
E.
6.7 × 10-10 M
Question #11
What is the concentration of the hydronium ions in an acidic solution?
A.
0.0 M
B.
1.0 × 10-14 M
C.
1.0 × 10-7 M
D.
> 1.0 × 10-7 M
E.
< 1.0 × 10-7 M
Question #12
The pH of a solution is 5.00. Which of the following is TRUE about the solution?
A.
none of these
B.
It is more acidic than a solution whose pH is 4.00.
C.
Its [H3O+] is 1.0 × 10-5 M
D.
Its [H3O+] is 1.0 × 10-9 M
E.
Its [H3O+] is 1.0 × 105 M
Question #13
What is the concentration of the hydronium ions in a neutral solution?
A.
1.0 × 10-7 M
B.
< 1.0 × 10-7 M
C.
0.0 M
D.
> 1.0 × 10-7 M
E.
1.0 × 10-14 M
Question #14
What is the concentration of hydronium ions in a solution given that the concentration of hydroxide ions is 2.31 × 10-4 M?
A.
2.31 × 10-18 M
B.
4.33 × 10-11 M
C.
1.01 × 10-5 M
D.
2.31 × 1010 M
E.
none of these
Question #15
Which solution below has the highest concentration of hydroxide ions?
A.
pH = 7.00
B.
pH = 3.21
C.
pH = 10.12
D.
pH = 12.49
E.
pH = 7.93
Question #16
In order for a solution to be acidic:
A.
[H3O+] > [OH-]
B.
none of these
C.
[H3O+] = [OH-]
D.
[H3O+] < [OH-]
E.
pH = pOH
Question #17
In order for a solution to be basic:
A.
pH = pOH
B.
[H3O+] > [OH-]
C.
[H3O+] < [OH-]
D.
none of these
E.
[H3O+] = [OH-]
Question #18
What is the concentration of the hydroxide ions in an acidic solution?
A.
1.0 × 10-14 M
B.
0.0 M
C.
1.0 × 10-7 M
D.
< 1.0 × 10-7 M
E.
> 1.0 × 10-7 M
Question #19
In a solution that has a pH = 7.0:
A.
[H3O+] + [OH-] = Kw
B.
[H3O+] = [OH-]
C.
none of these
D.
[H3O+] < [OH-]
E.
[H3O+] > [OH-]
Question #20
A solution at 25°C has a hydrogen ion concentration of 2.6 × 10-5 M. Which of the following is TRUE?
A.
[H3O+] =
B.
[H3O+] > [OH-]
C.
none of these
D.
[H3O+] < [OH-]
E.
[H3O+] = [OH-]
Question #21
What is the pH of a solution that has a H⁺ concentration equal to ?
A.
none of these
B.
4.77
C.
5.2
D.
10.2
E.
0.22
Question #22
If the pH of an aqueous solution changed from 9.10 to 4.67, what happened to the hydronium ion concentration?
A.
It became zero.
B.
It became less than zero.
C.
none of these
D.
It decreased.
E.
It increased.
Question #23
What is the [H⁺] in a solution that has a pH of 3.35?
A.
4.5 × 10-4 M
B.
1 × 103.35 M
C.
none of these
D.
2.2 × 103 M
E.
3.35 × 10-14 M
Question #24
What is the pOH of a solution that has a OH- concentration equal to ?
A.
4.29
B.
-4.3
C.
4.12
D.
9.89
E.
none of these
Question #25
What is the [OH-] in a solution that has a pOH of 9.65?
A.
9.8 × 10-1 M
B.
4.5 × 105 M
C.
4.5 × 10-9 M
D.
2.2 × 10-10 M
E.
none of these
Question #26
Which solution below is considered to have basic character?
A.
none of these
B.
pH = 2
C.
pOH = 13
D.
pOH = 4
E.
pOH = 7
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