Drill: Calculate the pH of 0.10 M H 2 Z in 0.50 M KHZ. K a1 = 2.0 x 10 -5 K a2 = 5.0 x 10 -9. 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.

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Drill: Calculate the pH of 0.10 M H 2 Z in 0.50 M KHZ. K a1 = 2.0 x 10 -5 K a2 = 5.0 x 10 -9

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Drill: Calculate the pH of 0.10 M H2Z in 0.50 M KHZ.Ka1 = 2.0 x 10-5 Ka2 = 5.0 x 10-9

Salt orHydrolysis 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

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- + H2O HA + OH-

B+ + H2O H+ + BOH

Drill: Calculate the salt/acid ratio of a solution of benzoic acid & sodium benzoate at a pH of 5.00.KaHBz = 6.4 x 10-5

Salt or Hydrolysis Problems

Salt Problem

Calculate the pH of a 0.20 M solution of NaBz

Ka HBz = 6.4 x 10-5

Drill: Calculate the pH of a solution of 0.10 M NH3 in 0.20 NH4Cl.Kb NH3 = 1.8 x 10-5

Salt or Hydrolysis Problems

Salt Problem

Calculate the pH of a 0.20 M solution of KNO2

Ka HNO2 = 7.1 x 10-4

Salt Problem

Calculate the pH of a 0.10 M solution of R-NH3Cl

Kb R-NH2 = 2.5 x 10-5

Calculate the pH of a 0.18 M solution of KC2H3O2

Ka = 1.8 x 10-5

Drill: Calculate the salt to acid ratio required to make a buffer solution with a pH of 4.495 using benzoic acid.KaHBz = 6.4 x 10-5

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

NaAcMnCl2

KNO3NH4Br

KHSO4NH4Ac

Predict Relative pH

KAcNaCl

KClO2NH4Cl

K2SO4NaI

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

Na2OSO2

NO2CO2

CaOAl2O3

Calculate the pH of a 0.16 M solution of KC7H5O2

Ka = 6.4 x 10-5

Calculate the pH of a solution of 0.0030 M KQ.

KaHQ = 3.0 x 10-5

Drill: Calculate the pH of a 0.72 M NH4NO3 solution.KbNH3 = 1.8 x 10-5

Are there any questions on previous material?

A/B eq, Buffer & Salt Hydrolysis Problem

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 10-3Ka2 = 6.2 x 10-8Ka3 = 4.2 x 10-13

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.

11.2 g of KOH 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 = 4.8 x 10-11

Drill: Calculate the pH of

0.10 M HF. Ka HF = 6.5 x 10-4

Test Review

Expect a straight acid/base problem like the drill

Calculate the pH of 0.10 M HF in 0.20 M KF. Ka HF = 6.5 x 10-4

Calculate the pH of 0.10 M KF. Ka HF = 6.5 x 10-4

Predict Relative pH

K2OMgO

ClO2(NH4)2O

SO3N2O3

Predict Relative pH

KAcNaCl

KClO2NH4Cl

K2SO4NaI

Calculate the pH of 5.0 M KCN. KaHCN= 5.0 x 10-10

Calculate pH of:

0.20 M MOHin

0.50 M MCl

Kb = 5.0 x 10-5

Calculate pH of:

0.20 M MCl

Kb = 5.0 x 10-5

Drill: Calculate the pH of0.20 M KQ. KaHQ = 8.0 x 10-5

Calculate pH of:

0.20 M HNO2

Ka = 2.0 x 10-4

Calculate pH of:

3.0 M HZin

2.0 M KZ

Ka HZ = 3.0 x 10-5

Calculate pH of:

0.20 M KR

Ka HR = 2.0 x 10-5

Calculate pH of:

2.0 M HQ

Ka = 2.0 x 10-6

Calculate pH of:

0.60 M HZin

0.90 M KZ

Ka HZ = 3.0 x 10-5

Calculate pH of:

0.20 M KQ

Ka 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 H2SO3. Calculate [H2SO3], [HSO3-], [SO3-2], [H+], [OH-], & pH of the solution.Ka1 = 1.7 x 10-2Ka2 = 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

KW, KA, KB, & pH

Calculate pH of:

0.025 M HNO3

0.020 M KOH

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

Calculate [H3A], [H2A-1], [HA-2], [A-3], [K+], [H+],[OH-], & pH of 2.0 M KH2A. Ka1 = 4.0 x 10-3Ka2 = 5.0 x 10-8Ka3 = 2.5 x 10-13

The take-home portion of the test is due by 8:15 tomorrow