Acid/Base Titration Virtual Lab
Website: http://www.mhhe.com/physsci/chemistry/animations/chang_7e_esp/crm3s5_5.swf
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?
Chemistry – S. Martinez
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Acid/Base Titration Virtual Lab
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. Is the solution in the flask acidic, basic, or neutral? Explain using the terms ions and molecules in
your explanation.
16. Write the reaction for the neutralization reaction between the acid and the base in this titration. Be
sure to indicate the phases of the ions and molecules.
17. Now add 5.00 mL more of NaOH.
18. What happens to the pH?
19. Add 5.00 mL of NaOH again. Does the pH change?
20. Make a sketch of the titration curve, labeling the axes, with pH as the dependant variable and
volume of NaOH as the independent variable.
21. What is the net ionic equation for this reaction?
22. Why is it different than the complete neutralization reaction?
23. Given the molarity of NaOH and the initial volume of HCl, calculate the molarity of the solution.
Chemistry – S. Martinez
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Acid/Base Titration Virtual Lab
24. What is the pH at the equivalence point?
25. What does the pH at the equivalence point tell you about the strength of the acid and the strength
of the base?
BONUS QUESTION:
Does the equivalence point change based on the strengths of the acids and bases involved in the
titration? Explain using graphs.
Chemistry – S. Martinez
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