character: Mr. Johnson
topic: Understanding pH Levels
grade: 12
subject: Chemistry
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character: Ms. Taylor
topic: Acid-Base Reactions
grade: 12
subject: Chemistry
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character: Dr. Smith
topic: The Importance of pH in Biological Systems
grade: 12
subject: Chemistry
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character: Professor Lee
topic: Measuring pH: Techniques and Applications
grade: 12
subject: Chemistry
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