Questions on pOH Scale and Calculations
20 Multiple-Choice Questions on pOH Scale and Calculations
1. What does pOH measure in a solution?
A) The concentration of hydrogen ions (H⁺)
B) The concentration of hydroxide ions (OH⁻)
C) The temperature of the solution
D) The total ion concentration
E) The concentration of neutral molecules
2. Which equation correctly defines pOH?
A) pOH = –log[H⁺]
B) pOH = –log[OH⁻]
C) pOH = log[H⁺]
D) pOH = [OH⁻] × 10
E) pOH = log[OH⁻]
3. If the pOH of a solution is 4, what is the concentration of OH⁻ ions?
A) 4 M
B) 1.0 × 10⁻⁴ M
C) 4 × 10⁻⁴ M
D) 1.0 × 10⁻¹⁰ M
E) 10⁴ M
4. What is the pOH of a solution where [OH⁻] = 1.0 × 10⁻⁶ M?
A) 6
B) 8
C) 10
D) 14
E) 4
5. At 25°C, what is the relationship between pH and pOH?
A) pH + pOH = 7
B) pH – pOH = 14
C) pH + pOH = 14
D) pH × pOH = 14
E) pH = pOH
6. If the pOH of a solution is 3, what is the pH?
A) 3
B) 7
C) 11
D) 14
E) 17
7. What is the pOH of pure water at 25°C?
A) 0
B) 7
C) 14
D) 1
E) 10
8. A solution has a pH of 9. What is the pOH?
A) 5
B) 9
C) 14
D) 23
E) 7
9. Which of the following represents a basic solution?
A) pOH = 7
B) pOH = 8
C) pOH = 6
D) pOH = 10
E) pOH = 14
10. How would you calculate the pOH of a solution if the [H⁺] = 1.0 × 10⁻³ M?
A) pOH = –log(1.0 × 10⁻³)
B) pOH = 3
C) pOH = 14 – 3
D) pOH = 11
E) Both C and D
11. What is the concentration of OH⁻ ions in a solution with pOH = 12?
A) 1.0 × 10⁻¹² M
B) 1.0 × 10⁻² M
C) 1.0 × 10⁻⁸ M
D) 12 M
E) 14 M
12. What is the pOH of a solution with [OH⁻] = 2.5 × 10⁻⁵ M?
A) 5.60
B) 4.40
C) 10.40
D) 14.00
E) 9.60
13. If a solution has a pOH of 0, what is the concentration of OH⁻ ions?
A) 1 M
B) 0 M
C) 10 M
D) 0.1 M
E) 14 M
14. Which pOH value corresponds to a neutral solution at 25°C?
A) 0
B) 7
C) 14
D) 1
E) 10
15. For a solution with pH = 5, what is the pOH?
A) 5
B) 9
C) 7
D) 14
E) 10
16. How would you find [OH⁻] if the pOH = 6?
A) 6 M
B) 1 × 10⁶ M
C) 1 × 10⁻⁶ M
D) 6 × 10⁻¹ M
E) –6 M
17. If [OH⁻] = 3.2 × 10⁻³ M, what is the pOH?
A) 3.49
B) 2.49
C) 5.51
D) 11.51
E) 0.0032
18. A solution has a pOH of 9. What is the pH?
A) 5
B) 9
C) 14
D) 23
E) 7
19. Which of the following pOH values indicates the strongest base?
A) 7
B) 14
C) 1
D) 10
E) 6
20. What is the pOH of a solution with pH = 12?
A) 12
B) 2
C) 7
D) 14
E) 0
- Questions on Lewis Acids and Bases
- Questions on Self-Ionization of Water (Kw)
- Questions on pH and Calculating pH
Answer Key
1. B
2. B
3. B
4. A
5. C
6. C
7. B
8. A
9. B
10. E
11. A
12. A
13. A
14. B
15. B
16. C
17. B
18. A
19. C
20. B
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