Chemistry 12

UNIT FOUR - Solubility Equilibria

 

G: Solubility Equilibria (Concept of Solubility)

G1. classify solutions as ionic or molecular given the formula of the solute

G2. describe the conditions necessary to form a saturated solution

G3. describe solubility as the concentration of a substance in a saturated solution

G4. use appropriate units to represent the solubility of substances in aqueous solutions

G5. measure the solubility of a compound in aqueous solution

G6. describe the equilibrium that exists in a saturated aqueous solution

G7. write a net ionic equation that describes a saturated solution

G8. calculate the concentration of the positive and negative ions given the concentration of a solute in an aqueous solution

H: Solubility Equilibria (Solubility and Precipitation)

H1. describe a compound as having high or low solubility relative to 0.1 M by using a solubility chart

H2. use a solubility chart to predict if a precipitate will form when two solutions are mixed, and identify the precipitate

H3. write a formula equation, complete ionic equation, and net ionic equation that represent a precipitation reaction

H4.use a solubility chart to predict if ions can be separated from solution through precipitation, and outline the process

H5. predict qualitative changes in the solubility equilibrium upon the addition of a common ion

H6. identify an unknown ion through experimentation involving a qualitative analysis scheme

H7. devise a procedure by which the contaminating ions in hard or polluted water can be removed

I: Solubility Equilibria (Quantitative Aspects)

I1.describe the Ksp expression as a specialized Keq expression

I2. write a Ksp expression for a solubility equilibrium

I3. calculate the Ksp for AB and AB2type compounds when given the solubility of a compound

I4. calculate the solubility of AB and AB2 type compounds from the Ksp

I5. predict the formation of a precipitate by comparing the trial ion product to the Ksp value using specific data

I6. calculate the maximum concentration of one ion given the Ksp and the concentration of the other ion

I7. demonstrate and describe a method for determining the concentration of a specific ion

 

Lesson Plan - Unit 1

Period #1 - Equilm Exam and Introduction to Solubility

Materials : Textbook : Hebden

Objectives : students should be able to :

Meet all Learning Outcomes from Dynamic Equilibrium Unit

G1. classify solutions as ionic or molecular given the formula of the solute

G2. describe the conditions necessary to form a saturated solution

G3. describe solubility as the concentration of a substance in a saturated solution

G4. use appropriate units to represent the solubility of substances in aqueous solutions

G5. measure the solubility of a compound in aqueous solution

G6. describe the equilibrium that exists in a saturated aqueous solution

 

Part I - Exam- Dynamic Equilibrium :

Students write Dynamic Equilibrium Unit Test.

Part II - Introduction to Solubility - Notes :

Give students notes on Electrolytes and Non-Electrolytes, page 4-1, define molecular and ionic solutions and give examples of each. State the rules for classifying a compound as ionic or molecular. (G1)

Define the term solubility (G3) and determine appropriate units associated with solubility (G4), and saturated, discuss conditions necessary (G2). Give examples on page 4-2 of dissociation and crystallization reactions, and discuss the equilibrium established in a saturated solution (G6).

Demonstrate how to calculate molar solubility given the mass of a substance present in 1 Liter of solution (G5). See examples on page 4-3 of notes.

Exercise :

Questions 1-2 page 74 of Hebden.

Questions 3-7 page 76 of Hebden.

Questions 8-17 pages 77-79 of Hebden.

 

Evaluation :

Unit Four Exam

Homework Checks

 

Lesson Plan - Unit Two

Period #2 Intro To Reaction Kinetics

Materials : Textbook : Chemistry 12 - Hebden

Review : Go Over Homework Questions from Last Day, point out the solubility of Ca(CH3COO)2 on the graph page 79 of Hebden.

Objectives : students should be able to :

Part I - Dissociation - Ionic Compounds :

Give notes starting page 4-4 on "Dissociation of Ionic Compounds" and discuss the term "low solubility" as defined to be a compound that has 0.1 M or less ions in solution. (H1)

Practice writing "Dissociation Reactions" of Ionic Compounds by doing overhead sheet. (G7)

Explain and demonstrate how to use the Table of Solubilities to determine when two solutions are mixed they form a compound with low solubility (a precipitate) or high solubility (no precipitate). (H2)

Review how to find Molarity of, also how to do dilution calculations. Do examples on page 4-5.

Review how to use simple ratios to calculate Molarity of individual ions in solution. Give notes, and do example on page 4-5. (G8)

Part II - Describing Reactions in Solution - Net Ionic Reactions :

Give notes on "Describing Reactions in Solution", give example and discuss the differences between formula equations, complete ionic equations and net ionic equations, on page 4-6. (H3)

Exercise :

Questions 21-24 page 83-84 of Hebden.

Questions 18-20 page 81 of Hebden.

Questions 25 page 87 of Hebden. (every other letter)

Prep For Lab 16D

Evaluation :

Unit Four Exam

Period #3 Solubility and Ksp

Materials : Textbook : Chemistry 12 - Hebden

Review : Go over questions from Homework, and factors affecting reaction rates

Objectives : students should be able to :

H4.use a solubility chart to predict if ions can be separated from solution through precipitation, and outline the process

H6. identify an unknown ion through experimentation involving a qualitative analysis scheme

I: Solubility Equilibria (Quantitative Aspects)

I1.describe the Ksp expression as a specialized Keq expression

I2. write a Ksp expression for a solubility equilibrium

 

Part I - Separating Mixtures - Precipitation Methods :

Give notes on page 4-7 describing how to separate ions in mixtures using precipitation methods. Do several examples pages 4-7 and 4-8. (H4)

 

Part II - Lab 16 D - Solubility Trends and Precipitate Formation :

Do Pre Questions for Lab 16 D.

Do Lab 16 D. (H6)

 

Part III - Solubility Product - Introduction :

Give notes on page 4-9 describing the solubility equilibrium expression, (I1) and explain how to write a Ksp expression for a solubility equilibrium (I2).

Explain how to read the "Solubility Products Table".

 

Exercise :

Questions 26-36 (odds) and 37, 38, 39 page 90-91 of Hebden.

Questions 40-41 page 91-92 of Hebden

Evaluation :

Unit Four Exam

Homework Checks

Lab 16D

Assignment #4

Period #4 More on Ksp

Materials : Textbook : Chemistry 12 - Hebden

Review : Go over questions from Homework, and factors affecting reaction rates

Objectives : students should be able to :

I: Solubility Equilibria (Quantitative Aspects)

I1.describe the Ksp expression as a specialized Keq expression

I2. write a Ksp expression for a solubility equilibrium

I3. calculate the Ksp for AB and AB2type compounds when given the solubility of a compound

I4. calculate the solubility of AB and AB2 type compounds from the Ksp

I6. calculate the maximum concentration of one ion given the Ksp and the concentration of the other ion

I7. demonstrate and describe a method for determining the concentration of a specific ion

Part I - Ksp Review - From Last Day :

Review notes on page 4-9 describing the solubility equilibrium expression, (I1) and explain how to write a Ksp expression for a solubility equilibrium (I2).

 

Part II - Solubility Product - Calculations :

Give notes on page 4-9 describing more about solubility equilibrium (I7)

Do examples starting on page 4-10 (I3, I4, I6, I7).

 

Exercise :

Questions 42, 44, 46, 48, 50, 55 on page 95 of Hebden.

Evaluation :

Unit Four Exam

Homework Checks

Assignment #4

Unit 4 Test

Period #5 Trial Ksp

Materials : Textbook : Chemistry 12 - Hebden

Review : Go over questions from Homework, and factors affecting reaction rates

Objectives : students should be able to :

I: Solubility Equilibria (Quantitative Aspects)

I1.describe the Ksp expression as a specialized Keq expression

I2. write a Ksp expression for a solubility equilibrium

I3. calculate the Ksp for AB and AB2type compounds when given the solubility of a compound

I4. calculate the solubility of AB and AB2 type compounds from the Ksp

I5. predict the formation of a precipitate by comparing the trial ion product to the Ksp value using specific data

I6. calculate the maximum concentration of one ion given the Ksp and the concentration of the other ion

 

Part I - Ksp Review - From Last Day :

Go over homework questions (I1-I4, I6)

 

Part II - Solubility Product - Calculations :

Take notes on page 4-12 explaining how to calculate Q and compare it to Ksp (I5).

 

Exercise :

Questions 42, 44, 46, 48, 50, 55 on page 95 of Hebden.

Evaluation :

Unit Four Exam

Homework Checks

Assignment #4

Unit 4 Test

Period #6 Removing Pollution & The Common Ion Effect

Materials : Textbook : Chemistry 12 - Hebden

Review : Go over questions from Homework

Objectives : students should be able to :

H: Solubility Equilibria (Solubility and Precipitation)

H5. predict qualitative changes in the solubility equilibrium upon the addition of a common ion

H7. devise a procedure by which the contaminating ions in hard or polluted water can be removed

Part I - Removing Pollution - Using Precipitation Methods :

Give notes on page 4-14 describing how to remove Metal Ion pollutants using precipitation methods. Do example on page 4-14. (H7)

 

Part II - Hardness in Water - Origins and Getting Rid of it :

Give notes on page 4-14 describing what Hardness in Water is, where it comes from and how to get rid of it using precipitation method. Do examples on page 4-15. (H7)

 

Exercise :

Questions 76-80 page 104 of Hebden.

 

Part III - Common Ion Effect - Introduction :

Give notes on page 4-16 describing the common ion effect, and explain how to decrease the solubility of a salt and increase the solubility of a salt. (H5).

 

Exercise :

Questions 81-86 page 108 of Hebden.

Evaluation :

Unit Four Exam

Homework Checks

Assignment #4

Unit 4 Exam

Period #7 Review

Materials : Textbook : Chemistry 12 - Hebden

Review : Go over questions from Homework

Objectives : students should be able to :

Review all Learning Outcomes for this Unit

Part I - Reveiw - Solubility Unit :

Work on Practice Questions and go over Practice Questions

Work on Unit Hand in Assignment

Evaluation :

Unit Four Exam

Unit 4 Handin Assignment

Unit 4 Exam