Acid Base Titrations
What is a Titration?
A titration is one of many techniques used in chemistry to determine the amount of a specific chemical in a sample solution, using stoichiometry and the knowledge of the nature of acids and bases. It involves the progressive addition of a solution of known concentration into a sample solution, with the use of an indicator to determine the point at which all sample has been consumed-commonly referred to as the equivalence point of the titration.
A titration is one of many techniques used in chemistry to determine the amount of a specific chemical in a sample solution, using stoichiometry and the knowledge of the nature of acids and bases. It involves the progressive addition of a solution of known concentration into a sample solution, with the use of an indicator to determine the point at which all sample has been consumed-commonly referred to as the equivalence point of the titration.
LESSON OVERVIEW (SPECIFIC EXPECTATIONS E1.1, E2.3, E2.4, E2.5, E3.4)
Lesson Hook:
To introduce the importance of titrations outside of a chemistry lab, initiate a discussion about the titrations normally done in industry and their purpose. A few common examples include analysis of ammonia levels in wastewater, contamination levels in natural rain, acidity levels in food and wine, and numerous examples in pharmacology. The video below, courtesy of YouTube gives a short explanation of the causes and ramifications of acid rain and can be used to initiate a lively discussion.
To introduce the importance of titrations outside of a chemistry lab, initiate a discussion about the titrations normally done in industry and their purpose. A few common examples include analysis of ammonia levels in wastewater, contamination levels in natural rain, acidity levels in food and wine, and numerous examples in pharmacology. The video below, courtesy of YouTube gives a short explanation of the causes and ramifications of acid rain and can be used to initiate a lively discussion.
Action:
The best way for students to grasp the concept of titrations is to preform one, or two, or more. Incorporate previous lessons by including the creation of a standardized solution along with the titration of a weak acid with a strong base or vice versa. There are numerous titration labs available online and through various institutions such as OISE. Click below for one example of a titration of a weak acid with a strong base. It is suggested at this point to have students produce a formal lab write-up to prepare them for the requirements at most universities. Click below for an example of a titration lab for determining the Ka value for an unknown acid, including standardization procedure, discussion questions and rubric courtesy of .docstoc
The best way for students to grasp the concept of titrations is to preform one, or two, or more. Incorporate previous lessons by including the creation of a standardized solution along with the titration of a weak acid with a strong base or vice versa. There are numerous titration labs available online and through various institutions such as OISE. Click below for one example of a titration of a weak acid with a strong base. It is suggested at this point to have students produce a formal lab write-up to prepare them for the requirements at most universities. Click below for an example of a titration lab for determining the Ka value for an unknown acid, including standardization procedure, discussion questions and rubric courtesy of .docstoc
Determining the Ka of an Unknown Acid-Titration Lab | |
File Size: | 227 kb |
File Type: | doc |
In lieu of, or in addition to a formal lab, there are numerous virtual titrations demonstrations and titrations available online. McGraw-Hill has an interactive website set up that allows students to preform a virtual titration with listening to a voice-over explanation of what is occurring in solution. Click below to be redirected to McGraw-Hill's titration animation.
Debrief:
In pairs or in lab groups, have students preform a 60 second challenge to each other-in 60 seconds summarize the main concept taught in this lesson. Have students agree on a collaboration of their individual 60 second sum up's and then post on the board.
FOPP: Commitment to students and student learning, professional knowledge and professional practice
In pairs or in lab groups, have students preform a 60 second challenge to each other-in 60 seconds summarize the main concept taught in this lesson. Have students agree on a collaboration of their individual 60 second sum up's and then post on the board.
FOPP: Commitment to students and student learning, professional knowledge and professional practice
The concept of Acid Base Titrations can be reinforced in a variety of ways to appeal to all forms of multiple intellegences. Click below for a few resources that can be used in conjunction with a lesson to further demonstrate the concept of Acid Base Titrations.