Which indicators are the most effective and why?
Element SC7.b - The learner will compare, contrast, and evaluate the nature and behavior of acids and bases.
1. Due - pH WS
2. Lab - Indicators and Everyday Acids and Bases
Episode 1102: Indicators and pH Scale
3. Review Sheets - Test Tomorrow
3. HW - Finish Review Sheets
Lab Questions:
1. Which of the solutions tested were acids? How do you know?
2. Which of the solutions tested were bases? How do you know?
3. What properties do acids share?
4. What properties do bases share?
5. What properties do acids and bases both share?
6. Were any of the substances that you tested neither acidic or basic? What's the common name for these substances?
7. Which indicator gave you the most accurate results? Explain.
8. Which indicator would be used to determine if you needed a quick determination if a solution is an acid or base?
9. What was the unknown solution? Acid or Base? How do you know?
10. Construct a pH scale and place all samples on the scale.
11. Make a cabbage color scale from your samples.
12. What is a false positive? Were there any false positives in the lab? Why is it a false positive?
Conclusion:
1. Discuss acids and bases.
2. Discuss indicators and how they work. Which are better and why.
3. Use examples from your lab to support your conclusions.
4. Discuss whether your lab predictions were correct.
5. Discuss any errors.