In this activity, students will watch a video about the history of acids and bases. They will learn about the evolution of these theories, from Lavoisier to Arrhenius, Bronsted-Lowry, and Lewis.
High and Middle School
By the end of this activity, students should be able to
- Describe how the various acid and base theories have progressed through the centuries.
- Understand the pH scale.
This activity supports students’ understanding of
- Acid & Bases
- Acid/Base Theories
- Strong vs. Weak Acids
- History of Chemistry
Teacher Preparation: minimalLesson: 10 minutes
- No specific safety precautions need to be observed for this activity.
- The Acid & Base Guys video was developed as a part of the AACT original video series, Founders of Chemistry. The entire series can be found here.
- The running time of this video is six minutes.
- This video is intended for students to watch, and for teachers to integrate into their curriculum.
- The student questions/answers are presented in sequential order in the video.
- An answer key has also been provided for teacher reference.
- Videos can be shown with the use of a classroom projector, or teachers can generate a Student Video Pass through their AACT membership to allow students to independently access the video.
For the Student
While watching the Founders of Chemistry Video about The Acid & Base Guys, answer the following questions:
- What was the first definition of acid and who thought of it?
- Why was that first definition wrong?
- What was Arrhenius’s definition? What observation made him think of this definition?
- What does the pH scale measure?
- When was the pH scale created?
- What is a Bronsted-Lowry acid? What is a Bronsted-Lowry base?
- What is a Lewis acid? What is a Lewis base?
- Which definitions do chemists use today? How do today’s chemists decide which definition to use?