1. Acid-Base Equilibria pH and pOH
Relationship of Conjugate Pair acid-base strength.
When acids or bases control pH:
determine K
predict pH
When pH controls acid/base state:
predict acid/base state
use acid/base state to determine pH
Buffer action
pH titration curves

2. Acid-Base Equilibria pH and pOH
Relationship of Conjugate Pair acid-base strength.
When acids or bases control pH:
determine K
predict pH
When pH controls acid/base state:
predict acid/base state
use acid/base state to determine pH
Buffer action
pH titration curves

4. pH/pOH Calculations [H3O+][OH-] = 1.0 x 10-14
pH = -log[H3O+] pOH = -log[OH-]
[H3O+] = 10-pH [OH-] = 10-pH
pH + pOH = 14.00
What is the pH of a solution with [H3O+] = 4.6 x 10-5
What is the pOH of a solution with [OH-] = 3.3 x 10-4
What is the pOH of a solution with [H3O+] = 2.4 x 10-3
What is [H3O+] when pH = 4.2

6. Strong acids and bases
For strong acid solutions, [H3O+] = [acid] (except for H2SO4)
For strong bases LiOH, NaOH, KOH, RbOH, [OH-] = [base]
For strong bases Ca(OH)2, Ba(OH)2, etc., [OH-] = 2 x [base]

8. What is the pH when [H3O+] = 0.045 M?
13.995
-1.35
1.35

9. What is the pH when [OH-] = 6.5 x 10-4 M?
3.18
-3.18
10.81
15.18

10. What is the [H3O+] when pH = 3.66 M?
2.18 x 10-4
10.34
4570
3.66

11. What is the [OH-] when pH = 5.84 M?
1.45 x 108
3.31 x 10-6
6.92 x 10-9
5.84

12. A bit more on the pH scale

13. Acid-Base Equilibria Bronsted Acid: H+ (proton) donor
Bronsted Base: H+ acceptor
Acid-Base reactions: H+ transfer reaction
Conjugate Acid-Base Pairs:
acid conjugate base
HF F-
NH4+ NH3

15. What is the conjugage base of HNO2?

16. What is the conjugage acid of HPO42-?

17. Acid-Base Strength: Depends on Equilibrium Constant

20. Trends in relative acid/base strength for conjugate pairs.

22. Determining the Ka Value
0.10 M oxalic acid
pH =

23. Enter question text... 5 10 50
100
200

24. Determining the Ka Value
What is the value of Ka for an acid, HA, for which a
0.240 M solution has a pH of 3.28?

25. Determining Kb:
A M solution of a weak base has a pH of What is Kb?

26. What is the pH of a 0.150 M solution of HCl?
Predicting pH: Strong Acid solution
What is the pH of a M solution of HCl?

27. Using pH to determine [acid]

32. What is the pH of a 0.150 M solution of HF?
Predicting pH: Weak Acid solution
What is the pH of a M solution of HF?

35. What is the pH of a 0.150 M solution of HCN?
Predicting pH: Very Acid solution
What is the pH of a M solution of HCN?

36. Predicting pH: Strong Base solution
What is the pH of a M solution of Ca(OH)2?

37. Predicting pH: Weak base solution
What is the pH of a M solution of NH3?

38. Polyprotic Acids
H2CO HCO CO32-
H3PO H2PO HPO PO4 3-