character: Michael Brown
topic: Indicators and Their Uses
grade: 9
subject: Chemistry
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character: Acid-Base Indicators
topic: Chemical Reactions
grade: 9
subject: Chemistry
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character: pH Scale
topic: Measurement of Acidity and Basicity
grade: 9
subject: Chemistry
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character: Litmus Paper
topic: Testing Acidity and Alkalinity
grade: 9
subject: Chemistry
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