character: Dr. Emily Johnson
topic: Titration for Water Quality Testing
grade: 12
subject: Chemistry
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character: Mr. Alex Turner
topic: Analytical Techniques in Environmental Chemistry
grade: 12
subject: Chemistry
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character: Ms. Sarah Lee
topic: Impact of pH on Water Quality
grade: 12
subject: Chemistry
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character: Dr. Michael Smith
topic: Understanding Water Hardness and its Measurement
grade: 12
subject: Chemistry
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