Drill: Calculate the pH of 0.10 M H 2 Z in 0.50 M KHZ. K a1 = 2.0 x K a2 = 5.0 x 10 -9

Review Drill & Check HW

CHM II HW Review PP-24. Complete the attached assignment & turn it in tomorrow.

Salt or Hydrolysis Reactions

Hydrolysis Any reaction in which water is decomposed with all or part of its decomposition portions combining with the products

Hydrolysis Water is added to decompose something

Hydrolysis MX + HOH HX + MOH

Salts

Ionic compounds that dissolve ~ 100 % in water

Salts of Acids Salts of acids are negative (A - )

Salts of Bases Salts of bases are Positive (M + or B + )

Salt Solutions When salts dissolve, their ions can recombine with water

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

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

Salt Solutions A - + H 2 O HA + OH - B + + H 2 O H + + BOH

Drill: Calculate the salt/acid ratio of a solution of benzoic acid & sodium benzoate at a pH of K a HBz = 6.4 x 10 -5

Salt or Hydrolysis Problems

Drill: Calculate the pH of a solution of 0.10 M NH 3 in 0.20 NH 4 Cl. K b NH 3 = 1.8 x 10 -5

Salt Problem Calculate the pH of a 0.20 M solution of NaBz K a HBz = 6.4 x 10 -5

Salt Problem Calculate the pH of a 0.10 M solution of R-NH 3 Cl K b R-NH 2 = 2.5 x 10 -5

Drill: Calculate the pH of a 0.18 M solution of KC 2 H 3 O 2 K a = 1.8 x 10 -5

Review Drill & Check HW

Collect Labs

CHM II HW Study for a quiz tomorrow Test Monday

AP CHM HW Read: Chapter 14 Problems: 43 Page: 422

CHM II HW Read: Chapter 18 Problems: 83 Page: 790

Salt Applications Salts of strong acids & weak bases make acidic solutions

Salt Applications Salts of strong bases & weak acids make basic solutions

Salt Applications Salts of strong acids & strong bases make neutral solutions

Predict Relative pH NaAcMnCl 2 KNO 3 NH 4 Br KHSO 4 NH 4 Ac

Predict Relative pH KAcNaCl KClO 2 NH 4 Cl K 2 SO 4 NaI

Anhydrides Compounds without water; that when added to water, form other compounds

Acid Anhydrides Non-metal oxides that form acids when added to water

Basic Anhydrides Metal oxides that form bases when added to water

Predict Relative pH Na 2 OSO 2 NO 2 CO 2 CaOAl 2 O 3

Calculate the pH of a 0.16 M solution of KC 7 H 5 O 2 K a = 6.4 x 10 -5

Calculate the pH of a solution of M KQ. K a HQ = 3.0 x 10 -5

AP CHM HW Read: Chapter 14 Problems: 35 Page: 422

CHM II HW Read: Chapter 18 Problems: 67 & 75 Page:

Drill: Calculate the pH of a 0.72 M NH 4 NO 3 solution. K b NH3 = 1.8 x 10 -5

A/B eq, Buffer & Salt Hydrolysis Problems

AP Test Thursday

11.2 g of KOH was added to 2.0 L of M H 2 CO 3. Calculate the molarity of all ions present in the solution. K a1 = 4.4 x K a2 = 4.8 x

You need to make a buffer solution with its greatest buffering capacity at pH ~ 5.4. In general terms, describe what acid or base you would chose, & how you would make the buffer.

Calculate the pH of 0.10 M HF. K a HF = 6.5 x 10 -4

Calculate [H 3 PO 4 ], [H 2 PO 4 -1 ], [HPO 4 -2 ], [PO 4 -3 ], [K + ], [H + ], & pH of 1.0 M KH 2 PO 4 in 0.50 M K 2 HPO 4. K a1 = 7.5 x K a2 = 6.2 x K a3 = 4.2 x

Calculate the pH of 0.10 M HF in 0.20 M NaF. K a HF = 6.5 x 10 -4

Calculate the pH of 5.0 M KCN. K aHCN = 5.0 x

Calculate pH of: 0.20 M MOH in 0.50 M MCl K b = 5.0 x 10 -5

Calculate pH of: 0.20 M MCl K b = 5.0 x 10 -5

Drill: Calculate the pH of 0.20 M KQ. K a HQ = 8.0 x 10 -5

Predict Relative pH KAcNaCl KClO 2 NH 4 Cl K 2 SO 4 NaI

Predict Relative pH K 2 OMgO ClO 2 (NH 4 ) 2 O SO 3 N 2 O 3

Calculate pH of: 0.20 M HNO 2 K a = 2.0 x 10 -4

Calculate pH of: 3.0 M HZ in 2.0 M KZ K a HZ = 3.0 x 10 -5

Calculate pH of: 0.20 M KR K a HR = 2.0 x 10 -5

Calculate pH of: 2.0 M HQ K a = 2.0 x 10 -6

Calculate pH of: 0.60 M HZ in 0.90 M KZ K a HZ = 3.0 x 10 -5

Calculate pH of: 0.20 M KQ K a HQ = 2.0 x 10 -7

1.5 L of 0.25 M Ba(OH) 2 was added to 1.0 L of 0.60 M H 2 SO 3. Calculate [H 2 SO 3 ], [HSO 3 - ], [SO 3 -2 ], [H + ], [OH - ], & pH of the solution. K a1 = 1.7 x K a2 = 6.0 x 10 -8

Review of Acid/Base descriptions and Acid/Base, Buffer, & Salt Equilibria

Arhenius, Bronsted- Lowry, & Lewis Acids & Bases

Strong Acids Strong Bases

Acid rxns Base rxns

A/B Equilibrium Constants K W, K A, K B, & pH

Calculate pH of: M HNO M KOH

150 mL of 0.10 M KOH was added to mL of 0.10 M H 2 CO 3. Calculate [H 2 CO 3 ], [HCO 3 - ], [CO 3 -2 ], [H + ], [OH - ], & pH of the solution. K a1 = 4.4 x K a2 = 4.7 x

Calculate [H 3 A], [H 2 A -1 ], [HA -2 ], [A -3 ], [K + ], [H + ], [OH - ], & pH of 2.0 M KH 2 A. K a1 = 4.0 x K a2 = 5.0 x K a3 = 2.5 x