1. Acids and Base Review: Ch 14-15
phet.colorado.edu

2. Icons for Acid Base Solutions

3. 1.Order the solutions from lowest to highest pH.
X Y Z
B Y has most H30+ , then X then Z
A. X<Y<Z B. Y<X<Z C. Z<Y<X
D. Z<X<Y E. Y<Z<X

4. 2.Order the solutions from lowest to highest pH.
A X has most OH- (the blue ones) , then Y then Z (might want to refer to images on slide 2 or show sim)
X Y Z
A. X<Y<Z B. Y<X<Z C. Z<Y<X
D. Z<X<Y E. Y<Z<X

5. 3. Which image is from a strong acid?
X Y Z
A because there are no HA left. Discuss that it does not have the highest pH.
(D is an okay answer)
X B. Y C. Z
D. more than one E. none

6. 4. Which image is from a weak base?
X Y Z
D note that there are 3 types of particles showing incomplete dissociation. Strong bases totally dissociate like salts, weak ones only partially dissociate.
X B. Y C. Z
D. more than one E. none

7. 5. Strong acids have lower pH than weak acids.
True
False
C see next slide
Usually!

8. Always True Always False Sometimes True
7. A solution with [H3O+] = .1 M contains a stronger acid than a solution [H3O+] = .001 M.
Always True
Always False
Sometimes True
C see next slide for demonstration.
It depends of if it is a strong or weak acid, or on how much ionization occurs

9. 9. What ALWAYS distinguishes a weak acid from a strong acid?
A weak acid doesn’t dissociate as much in water; strong acids completely react.
A weak acid is more dilute than a strong acid.
A weak acid has a higher pH than a strong acid. A

10. Which equation shows a strong base?D B E C

11. 1. The color of a solution on its own identifies if it is an acid, base, or neutral solution.
B Show sim: the left is milk, then blood, then a custom liquid like NaOH
True
False
Pink are base and clear are acid

12. 2. Which solution is basic?
A B C
D. More than one E. None
Correct answer D (B and C) A milk, B blood C. custom at pH =12

13. 3. Which solution is acidic?
Correct answer is C, but they may argue E A. Custom pH =13 B. water pH =7 C. vomit pH=2
A B C
D. More than one E. Difficult to tell

14. 4. Which solution is basic?
Correct answer B A. Water pH =7 B. pH =13 C. soda pop pH =2.5
A B C
D. More than one E. None

15. 5. Which solution is acidic?
Correct answer D (A and B) A. Coffee pH =5 B. soda pop pH =2.5 C. custom pH =13,
A B C
D. More than one E. None

16. 6. How will adding water effect the pH?
Increase the pH
Decrease the pH
No pH change
A more water lessens the acidity, so pH goes up
Becomes less acidic= increase pH
more water lessens the acidity, so pH goes up

17. 7. How will adding equal amount of water effect the pH?
Increase the pH
Decrease the pH
The pH will be cut in half
No pH change
B: more water lessens the basicity , so pH goes down, but not by 2 (log scale)
more water lessens the basicity , so pH goes down, from 10 to 9.7, but not by 2 (log scale)

18. 8. What is the order from most acidic to most basic?
A B C
A B C
A C B
B A C
C B A
C A B
Correct answer is A A milk, B blood C. custom at pH =12

19. 9. What is the order from most acidic to most basic?
A B C
A C B
B A C
C B A
C A B
Correct answer C A. Water pH =7 B. pH =13 C. soda pop pH =2.5
A B C

20. The [H3O+] is 1.0x10-9. What is the pH and will it be an acidic or basic solution?

21. Acid, base, neutral? Proton donor Electron acceptor
Produced OH- ions in solution
Proton acceptor
pH of 7
Conducts electricity
Reacts with magnesium
Acid
Base
neutral
Both

22. Acid, base, neutral? Turns litmus paper blue Turns pH paper green
Turns phenolphthalein pink
Turns litmus paper pink
Base
Neutral
acid

23. Ba(OH)2 Name the following. H2CO3 HF Carbonic acid Hydrofluoric acid
Barium Hydroxide

24. A strong acid is…
very concentrated
exists primarily as ions

25. A weak base is a…
nonelectrolyte
Weak electrolyte
Strong electrolyte.

26. A water is a
Nonelectrolyte
weak electrolyte
strong electrolyte.

27. At the same concentration (Molarity) a strong acid will have a __________ pH as a weak acid.
Higher
Lower
the same

28. As concentration of a weak acid increases, the pH
Decreases
remains constant.

29. As the concentration of a weak acid increases, the number of ions
Decreases
Remains constant

30. As the concentration of a weak acid increases, conductivity
Decreases
Remains constant

31. As the strength of a weak acid increases, the proportion of ions to molecules
Decreases

32. As the strength of a weak acid increases, the conductivity
Decreases
remains constant

33. Acid Base Solutions: Strength and Concentration by Trish Loeblein July 2011
Learning goals: Students will be able to
Generate or interpret molecular representations (words and/or pictures) for acid or base solutions
Provide or use representations of the relative amounts of particles in acid or base solutions to estimate strength and/or concentration
Use common tools (pH meter, conductivity, pH paper) of acid or base solutions to estimate strength and/or concentration
See lesson plan for more details about goals
Some materials adapted from an activity by Lancaster /Langdon

34. pH Scale: qualitative learning goals
Determine if a solution is acidic or basic using
pH b) H3O+/OH- ratio molecular size representation c) Hydronium/Hydroxide concentration
Relate liquid color to pH.
Predict if dilution and volume will increase, decrease or not change the pH
Organize a list of liquids in terms of acid or base strength in relative order with supporting evidence. 
Write the water equilibrium expression. Describe how the water equilibrium varies with pH.