Salts

1
Salts
2
Salt Solutions

• The salts of weak acids can recombine with water
  producing basic solutions

3
Salt Solutions

• The salts of weak bases can recombine with water
  producing acidic solutions

4
Salt Solutions

• A- H2O HA OH-
• B H2O H BOH

5
Salt or Hydrolysis Problems
6
Salt Problem

• Calculate the pH of a 0.20 M solution of NaBz
• Ka 6.4 x 10-5

7
Salt Problem

• Calculate the pH of a 0.10 M solution of R-NH3Cl
• Kb 2.5 x 10-5

8
Drill

• Calculate the pH of a 0.18 M solution of KC2H3O2
• Ka 1.8 x 10-5

9
Drill

• Calculate the pH of a 0.16 M solution of KC7H5O2
• Ka 6.4 x 10-5

10
Salt Applications

• Salts of strong acids weak bases make acidic
  solutions

11
Salt Applications

• Salts of strong bases weak acids make basic
  solutions

12
Salt Applications

• Salts of strong acids strong bases make neutral
  solutions

13
Predict Relative pH

• NaAc BaCl2
• KNO3 NH4Br
• KHSO4 NH4Ac

14
Predict Relative pH

• KAc NaCl
• KClO2 NH4Cl
• K2SO4 NaI

15
Anhydrides

• Compounds without water that when added to
  water, form other compounds

16
Acid Anhydrides

• Non-metal oxides that form acids when added to
  water

17
Basic Anhydrides

• Metal oxides that form bases when added to water

18
Predict Relative pH

• Na2O SO2
• NO2 CO2
• CaO Al2O3

19
A/B eq, Buffer Salt Hydrolysis Problems
20
Calculate the pH of 0.10 M HF. Ka HF 6.5 x
10-4
21
7.4 g of Ca(OH)2 was added to 2.0 L of 0.075 M
H2CO3. Calculate the molarity of all ions present
in the solution.Ka1 4.4 x 10-7Ka2 4.7 x
10-11
22
Calculate the pH of 0.10 M HF in 0.20 M NaF. Ka
HF 6.5 x 10-4
23
Calculate the pH of 5.0 M KCN. KaHCN 5.0 x
10-10
24
Calculate H3PO4, H2PO4-1, HPO4-2, PO4-3,
K, H, pH of 1.0 M KH2PO4 in 0.50 M
K2HPO4. Ka1 7.5 x 10-3 Ka2 6.2 x 10-8 Ka3
4.2 x 10-13
25
Calculate pH of
0.50 M MOH in 0.20 M MCl Kb 5.0 x 10-5
26
Calculate pH of
0.20 M MCl Kb 5.0 x 10-5
27
Review of Acid/Base descriptions and Acid/Base,
Buffer, Salt Equilibria
28
Arhenius, Bronsted-Lowry, Lewis Acids Bases
29
Strong Acids Strong Bases
30
Acid rxns Base rxns
31
A/B Equilibrium Constants KW, KA, KB, pH
32
Calculate pH of

• 0.025 M HNO3
• 0.020 M KOH

33
Calculate pH of

• 2.0 M HNO2
• Ka 2.0 x 10-4

34
Calculate pH of

• 3.0 M HZ in
• 2.0 M KZ
• Ka HZ 3.0 x 10-5

35
Calculate pH of

• 0.20 M KQ
• Ka HQ 2.0 x 10-5

36
150 mL of 0.10 M KOH was added to 100.0 mL of
0.10 M H2CO3. Calculate H2CO3, HCO3-,
CO3-2, H, OH-, pH of the solution.Ka1
4.4 x 10-7Ka2 4.7 x 10-11
37
Calculate H3A, H2A-1, HA-2, A-3, K,
H,OH-, pH of 2.0 M KH2A. Ka1 4.0 x
10-3 Ka2 5.0 x 10-8 Ka3 2.5 x 10-13
38
Calculate pH of

• 2.0 M HQ
• Ka 2.0 x 10-6

39
Calculate pH of

• 6.0 M HZ in
• 4.0 M KZ
• Ka HZ 3.0 x 10-5

40
Calculate pH of

• 0.20 M KQ
• Ka HQ 2.0 x 10-7