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pH Calculation Practice

pH Calculation Practice

Assessment

Presentation

•

Chemistry

•

10th - 12th Grade

•

Medium

Created by

Andrew Baldwin

Used 38+ times

FREE Resource

13 Slides • 14 Questions

1

pH Calculation Practice

Interactive Practice

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2

Objective

Relate the acid-base strength and the hydrogen and hydroxide concentration to the pH of a given solution.

3

Poll

Question image

How confident are you in your ability to perform pH calculations?

Very confident

Somewhat confident

Barelty confident

Not confient at all

4

Multiple Choice

Question image

What is the pH of a solution with a hydrogen ion concentration of 1x10-4

1

3

2

10

3

4

4

14

5

Review

If given a concentration with a 1x10x, take the absolute value of the exponent as the value of the pH.

6

Multiple Choice

What is the pH for a solution with the following hydrogen ion concentration: 1x10-10?

1

10

2

4

3

3

4

14

7

Find the pOH from pH

8

Multiple Choice

If the pH of a solution is 4.0, what is the pOH?

1

4.0

2

10.0

3

1.0 x 10 -4

4

cannot be determined from the information

9

Finding the pOH from pH

  • The POGIL activity introduced you to the Kw value. (1.0x10-14)

  • If you take the negative log of Kw you get an answer of 14.

  • For this reason, pH + pOH must equal 14.

  • Use this relationship to determine the pOH value.

10

Multiple Choice

What is the pOH for the solution if the pH of the solution is 11?

1

11

2

3

3

14

4

1.0x10-7

11

Finding the [H+] from the pH

12

Multiple Choice

The pH of a solution is 8.43. What is the [H3O+]concentration?

1

3.7 x 10 -9

2

1.0 x 10-8.43

3

2.7 x 10-6

4

1.0 x 10-14

13

Find the [H+] from pH

  • We use the negative Log function to find the pH.

  • So if we want to go the opposite direction, we must use the inverse.

14

Calculator Use for inverse Log

  • If using a TI-30 or 84, Use the 2nd function LOG button

  • If using the google, click the "INV" button then choose 10x from there.

15

Multiple Choice

What is the [H3O+] for a solution with a pH of 3.25?

1

5.62x10-4

2

1778.28

3

5.62

4

1.79

16

Finding the [OH-] from pOH

17

Multiple Choice

If a solution has a pOH of 3.7 the [OH-] of the solution is

1

5.0 x 10-11

2

2.0 x 10-4

3

10.3

4

14

18

Finding the [OH-] from pOH

  • Similar to finding the hydrogen ion concentration from pH

  • Use the inverse Log function, make sure that it is the 10-pOH

19

Multiple Choice

if a solution has a pOH of 5.2 the [OH-] of the solution is

1

6 x 10 -6 M

2

6.3 x 10 -6 M

3

1.58 x 10-5 M

4

2 x 10-5 M

20

Finding the pH from [OH-]

21

Multiple Choice

Find the pH of a solution with [OH-] = 8.41 x 10-4. (Hint: find pOH, then pH)

1

3.08

2

10.92

3

9.88

4

11.23

22

Finding the pH from [OH-]

  • Find the pOH using pOH= - log[OH-]

  • Subtract the pOH from 14

23

Multiple Choice

What is the pH if the [OH-] is 3.13x10-9?

1

8.50

2

5.5

3

19.5

4

3.19x10-6

24

Poll

After practicing, How confident are you in completing pH calculations?

Very Confident

Somewhat confident

Barely Confident

Not confident at all

25

Challenge Round

Ready to check

26

Multiple Choice

A solution of KOH is 2.5 x 10-5 M. What is the [H+] concentration? (Hint: Find pOH, then pH, then [H+].)

1

4.60

2

9.40

3

3.98 x 10-10

4

1.0 x 10-4.60

27

Multiple Choice

What is the [OH-] if the pH is 4.9?

1

4.9 x 10-10 M

2

1.0 x 10-4 M

3

1.25 x 10-5 M

4

7.94 x 10-10 M

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