Acid Base Titration
A Multimedia Lesson and Laboratory Exercise

Outline of Contents:

1. Introduction

2. Goals: Cognitive Goals, Affective Goals, Strategies used for Instruction,

Universal Traits, Curricular Goals

3. Instructional Notes on Titration and Laboratory Exercises

4. Open Ended Problems for Students

5. Links to Related Sites

1. Introduction

The purpose of this site is to use the resources of the internet to teach a lesson on acids and bases and on titration. Teachers will be able to consult the site to construct a lesson and/or a laboratory exercise for their students to use in class. When used with standard laboratory equipment and materials, this site contains a complete lesson that can be modified by the teacher, or used in its present form by students.

The cognitive and affective goals, instructional strategies and universal traits mentioned in the "Goals" section of this document are based on the work of Richard W. Paul, as explained in Critical Thinking: How to Prepare Students for a Rapidly Changing World, Foundation for Critical Thinking, Santa Rosa, CA, 1995. One of the explicit goals of a lesson such as this is to increase the critical thinking skills of students while integrating the use of technology, student research, and laboratory experiences.

2. Goals

Cognitive Goals: Students will explicitly assess information provided to them.
Students will gather and organize information and data.

Affective Goals: Students will start to develop intellectual perseverance.
Students will develop confidence in their own reasoning.

Instructional Strategies:

Students will generate or assess solutions.
Students will make interdisciplinary connections.
Students will compare analogous situations and transfer
insights to new concepts.
Students will note significant similarities and differences.

Universal Traits Emphasized: Logic, Relevance

Curricular Goals: Students will learn/review the concepts of acid-base chemistry.
Students will learn about interactions between strong and
weak acids and bases.
Students will learn more about the process and use of titration.
Students will learn how to use titration to solve practical
problems.

3. Instructional Notes on Titration and Laboratory Exercises

A. Students should consult the following site to read the notes and try the self-directed exercises to explain the fundamentals of acid base chemistry. The Acid and Base pH Tutorial

B. This site will illustrate the hydrolysis of water and the production of hydrogen and hydroxide ions. There is also an explanation of indicators used to show various pH levels. Electrolysis of Water

C. Consult this site for a section on how to solve acid-base problems and titration problems. Chemistry Problem Sets

D. Use this site to see a video and read a description of acid base titration.
Chem 101

E. This is a more advanced site with graphs of titrations between different types of acids and bases, including graphs, explanations and quiz questions. Acid Base Lesson

F. This site is an advanced interactive tutorial on titrations of weak acids and strong bases. The titrations are presented graphically with randomized weak acids with various Ka values. Yue-Ling Wong’s Java Interactive Titration Simulation

 

4. Open Ended Problems for Students

A. Have students bring in samples of household products - foods and cleaning substances, for example - and have them add a small amount of universal indicator or red cabbage juice to each sample. Have students construct a table to reflect a continuum of pH values. Students can compare their results to a reference table of pH values of ordinary substances.

B. Students should devise a way of calculating the mass percentage of acid or base in ordinary substances like aspirin, vinegar, or antacids. The mass percent should be determined by titration and the students can also determine which products are most economical by comparing mass percent to cost.

C. Students will run actual titration procedures in class and compare them to the graphs and simulations found on line (see sites listed above and below). Students might be asked to analyze any differences between their own data and ideal data.

D. For the advanced student, calculation of the Ka of a weak acid can be accomplished by using a titration procedure. Have students write, perform, and analyze their own procedure to accomplish this objective.

 

5. Links to Related Sites

A. The Acid and Base pH Tutorial. Notes and self-directed exercises to explain fundamentals of acid-base chemistry. Very complete.
http://www.science.ubc.ca/~chem/tutorials/pH/Index.html

B. Electrolysis of Water. Pictures of electrolysis apparatus and explanations of acid base indicators used to show production of hydrogen and hydroxide ions during this process.
http://www.chem.uiuc.edu/demos/elec.html

C. Chemistry Problem Sets. A description of how to solve acid base and titration problems.
http://science.widener.edu/svb/pset/psets.html

D. pH Tutorial Launch. Notes and self-directed exercises on the fundamental concepts of acid base chemistry.
http://www.science.ubc.ca/~chem/tutorials/pH/launch.html

E. The Chem Team. Tutorials on acid base chemistry and various types of problems, including some practical applications.
http://dbhs.wvusd.k12.ca.us/ChemTeamIndex.html

F. World Chemistry. Java applets used to illustrate various acid base simulations and titrations.
http://www.intschool-leipzig.com/bailey/home/index/htm

G. Chem 101. Video of acid base titration and description of experiment.
http://library.advanced.org/3310/lographics/video/dtitrate.html

H. Acid Base Lesson. Interactive tutorials on titrations of strong acid-strong base, weak acid-strong base, strong acid-weak base, and weak acid-weak base. The site includes graphs of titrations, explanations, and interactive quiz material.
http://www.intschool-leipzig.com/bailey/tutorial/titrate/graphs.htm

I. Yue-Ling Wong’s Java Interactive Titration Simulation. Three graphical simulations of weak acid-strong base titrations. The operator controls the amount of base added and sees the generation of the graph of the titration. Various weak acids with different Ka values are randomly used in the simulations. Self check on calculations is included.
http://yip5.chem.wfu.edu/yip/java/titrate.html