The pH Scale

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Slide 21

LecturePLUS Timberlake

21

Learning Check pH4

A. The [H3O+] of tomato juice is 1 x 10-4 M.

What is the pH of the solution?

1) - 4 2) 4 3) 8

B. The [OH-] of an ammonia solution is

1 x 10-3 M. What is the pH of the solution?

1) 3 2) 11 3) -11

Slide 22

LecturePLUS Timberlake

22

Solution pH4

A. pH = - log [ 1 x 10-4] = -(- 4) = 4

B. [H3O+] = 1 x 10-11

pH = - log [ 1 x 10- 11] = -(- 11) = 11

Slide 23

LecturePLUS Timberlake

23

Learning Check pH5

The pH of a soap is 10. What is the [H3O+] of the soap solution?

1) 1 x 10 - 4 M

2) 1 x 1010 M

3) 1 x 10 - 10 M

Slide 24

LecturePLUS Timberlake

24

Solution pH5

The pH of a soap is 10. What is the [H3O+] of the soap solution?

[H3O+] = 1 x 10-pH M

= 1 x 10-10 M

Slide 25

LecturePLUS Timberlake

25

pH on the Calculator

[H3O+] is 4.5 x 10-6 M

pH = 4.5 x EXP(or EE) 6+/- LOG +/-

= 5.35

Slide 26

LecturePLUS Timberlake

26

Learning Check pH6

A soap solution has a [H3O+] = 2 x 10-8 M. What is the pH of the solution?

1) 8

2) 7.7

3) 6

Slide 27

LecturePLUS Timberlake

27

Solution pH6

A soap solution has a [H3O+] = 2.0 x 10-8 M. What is the pH of the solution?

B) 2.0 EE 8 +/- LOG +/- = 7.7

Slide 28

LecturePLUS Timberlake

28

Learning Check pH7

Identify each solution as

1. acidic 2. basic 3. neutral

A. _ HCl with a pH = 1.5

B. _ Pancreatic fluid [H+] = 1 x 10-8 M

C. _ Sprite soft drink pH = 3.0

D. _ pH = 7.0

E. _ [OH- ] = 3 x 10-10 M

F. _ [H+ ] = 5 x 10-12

Slide 29

LecturePLUS Timberlake

29

Solution pH7

Identify each solution as

1. acidic 2. basic 3. neutral

A. _1 HCl with a pH = 1.5

B. _2 Pancreatic fluid [H+] = 1 x 10-8 M

C. _1 Sprite soft drink pH = 3.0

D. _3 pH = 7.0

E. _1 [OH-] = 3 x 10-10 M

F. _2 [H+] = 5 x 10-12

Slide 30

Acid Rain

LecturePLUS Timberlake

30

Unpolluted rain has a pH of 5.6