First test all six samples, then complete two Change pH trials. After that, answer five questions, one at a time. They are graded together, and you can revise and try again.
pH Detectives
Explore first, then get all five right.
1 Test samples
2 Change pH
3 Answer 5
Explore any time as you answer.
ESTIMATED pH
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Dip a strip to test.
Dip → Lift → MatchThe indicator on the paper changes color.
ESTIMATED pH
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A fresh strip tests each change.
Test every sample
QUESTION 1 OF 5
You followed the evidence.
Use what you discovered to explain how pH can change.
All five answers correct
5 / 5
You used pH evidence to classify samples, compare acidity, recognize a chemical property, and predict changes.
Explain your thinking
Optional discussion or drawing:
Place samples A, B, and C on a pH scale.
Show how adding a base can change the pH of an acidic solution.
Explain why you should test again after each addition.
