pH Puzzle Pursuit

Circuit Solving Challenge

Name:

Date: _________ Period: ___

Instructions: Solve each clue below and write your answer on the line. Once solved, find the corresponding number in the grid at the bottom and shade the circle. You must show your work for full credit!

The pH & pOH Relationship (pH + pOH = 14)

WORKED EXAMPLE: Find pOH if pH = 4.5

14 − 4.5 = 9.5

2. pOH when a solution is neutral

3. pH + pOH = ?

4. pOH when pH = 2.2

8. pOH of a solution whose pH is 12.80

9. pH when pOH is 9.16

20. pH when pOH is 10.01

22. pH = 4.52, pOH = ?

Log Power: pH = −log[H⁺]

WORKED EXAMPLE: pH when [H⁺] = 1.0 x 10⁻⁵ M

−log(1.0 x 10⁻⁵) = 5.00

1. pH when [H⁺] = 4.66 x 10⁻⁸ M

6. pH when [H⁺] = 0.034 M

11. pOH when [OH⁻] = 5.49 x 10⁻⁹ M

16. pH when [H⁺] = 9.89 x 10⁻⁷ M

18. pH when [H⁺] = 1 x 10⁻³ M

19. pH when [H⁺] = 1.25 x 10⁻¹¹ M

pH Puzzle pursuit // Part 02

PAGE 02

III

Antilogs: [H⁺] = 10^−pH

WORKED EXAMPLE: [H⁺] if pH = 2.0

10^−2.0 = 1.0 x 10⁻² M

5. Hydroxide ion concentration [OH⁻] when pOH = 0.5

13. Hydroxide ion concentration [OH⁻] when pOH = 0.76

12. [H⁺] when [OH⁻] = 1.01 x 10⁻¹⁴ M (Hint: Use K_w = 10⁻¹⁴)

Solution Mastery: Multi-Step Logic

WORKED EXAMPLE: pOH when [H⁺] = 1.0 x 10⁻³ M

Step 1: Find pH = −log(1.0 x 10⁻³) = 3.0 → Step 2: pOH = 14 − 3 = 11.0

7. The [OH⁻] when the [H⁺] is 1.136 x 10⁻¹⁴ M

10. pOH when [H⁺] = 6.3 x 10⁻⁴ M

14. pH when there are 1.6 x 10⁻⁷ moles of H⁺ in 500 mL of solution.

15. pOH when there are 1.6 x 10⁻⁷ moles of H⁺ in 500 mL of solution.

17. pH of 350 mL of a solution that contains 2.64 x 10⁻² mol H₃O⁺

21. pH when [OH⁻] is 6.71 x 10⁻⁵ M

Puzzle Pursuit Grid

0.97

6.76

1.87

3.41

5.05

7.33

11.1

3.62

0.32

0.08

8.75

5.51

13.0

2.42

4.03

8.26

2.33

12.7

6.00

13.7

12.6

9.48

4.84

6.49

10.1

3.99

11.8

3.00

10.8

1.98

5.13

14.0

9.91

9.83

8.16

0.88

0.51

8.41

7.00

5.92

6.31

1.12

0.17

0.99

5.98

1.47

6.31

4.91

10.9

13.6

2.81

7.51

4.25

1.77

12.3

3.81

1.85

2.69

6.84

8.94

13.0

1.20

10.2

13.9

5.66

2.61

11.6

0.01

7.80

12.9

The pH & pOH Relationship (pH + pOH = 14)

Log Power: pH = −log[H+]

Antilogs: [H+] = 10−pH

Solution Mastery: Multi-Step Logic

Puzzle Pursuit Grid

Log Power: pH = −log[H⁺]

Antilogs: [H⁺] = 10^−pH

pH Puzzle Pursuit Worksheet

pH Puzzle Pursuit Worksheet

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