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Lazies, Just follow directions and Answer the questions on a separate piece of paper.

NO TALKING!!! Especially P.V.; J.I.; A.R.; K.M. & T.V.

You will perform a virtual titration! Before you begin however, it is important to review the formal definition of this procedure. See below and explore the links provided for additional information if required:

Titration Definition: A procedure that is used to determine the concentration of an acid or base.
A measured volume of an acid or base of known concentration is reacted with a sample to the equivalence point.

Next, go perform a virtual titration!

You are responsible for answering the questions that follow:

ACID BASE CHEMISTRY
USING TECHNOLOGY TO ENHANCE LEARNING

Questions

1. What is the initial pH of the solution in the Erlenmeyer flask?

2. What does this pH tell you about the “type” of solution we are beginning with (hint: is it an acid or base?)?

3. What ions are present in the Erlenmeyer flask initially?

4. What ions are present in the buret initially?

5. Draw a diagram of the lab set-up in your notebook and label the solutions

6. Begin your virtual titration

7. Add 5.00 mL of NaOH

8. Does the pH change? Explain what is happening to the ions in the Erlenmeyer flask.

9. Now add 15.00 mL of NaOH

10. What is the “new” pH? What is happening to the solution in the Erlenmeyer flask?

11. Now add, 10.00 mL more of NaOH to the flask, what happens to the pH? Why do you think there is such a change?

12. Explain why accuracy and precision are so important when performing titrations.

13. What is the total volume of solution in the Erlenmeyer flask now?

14. At pH=7.00, what ions/molecules are present in the Erlenmeyer flask?

15. Now add 5.00 mL more of NaOH.

16. What happens to the pH?

17. Add 5.00 mL of NaOH again. Does the pH change?

18. Make a sketch of the titration curve, labeling the axes, with pH as the dependant variable and volume of NaOH as the independent variable.