1. Titration Demo, Curves and Calculations

2. Objectives – Today I will be able to: Identify the acid, base, conjugate acid and conjugate base in a reaction Calculate the concentration of an unknown acid by using titration Analyze a titration curve to determine the equivalence point of the titration Informal assessment – monitoring student interactions and questions as they complete the practice Formal assessment – analyzing student responses to the calculations and the exit ticket Common Core Connection – Build Strong Content Knowledge – Reason abstractly and quantitatively – Use appropriate tools strategically – Attend to precision

3. Lesson Sequence Evaluate: Warm-Up Elaborate: Conjugate Acid/Base Practice Explain and Explore: Titration Notes/Demo/ Curve Analysis Elaborate: Titration Calculations Evaluate: Exit Ticket

4. Warm-Up Human blood has a pH of 7.3. Calculate the [H 3 O + ] What is the pH of a NaOH solution that has a [OH] of 0.025 M? Have your homework out on your desk

5. Objectives Today I will be able to: – Identify the acid, base, conjugate acid and conjugate base in a reaction – Calculate the concentration of an unknown acid by using titration – Analyze a titration curve to determine the equivalence point of the titration

6. Homework Wear closed toe shoes Tuesday and Wednesday next week – (May 6,7) Finish Titration Calculations

7. Agenda Warm-Up Conjugate Acid/Base Practice Titration Notes/Demo/ Curve Analysis Titration Calculations Exit Ticket

8. Conjugate Acid/Base Practice For the following, predict the products and label the acid, base, conjugate acid and conjugate base. NH 3(aq) + H 2 O (l) 

9. Titration Notes/Demo/Curves

10. Titration is a neutralization reaction – Products are salts and water – Salt produced can be slightly acidic, slightly basic or neutral (Depends on acid strength)

11. Goal of Titration Procedure use to determine the concentration of an unknown acid or base Standard solution – solution with the known concentration

12. A solution is titrated until the concentration of acid=base This is called the Equivalence Point If an acids and bases are transparent, how can we determine when the concentrations are equal? – Use phenolpthalein as an indicator Turns fuchsia in a basic solution Stop titrating when the solution turns light pink – This is called the endpoint

13. Watch Mr. Klotz’s Titration Demo

15. In the perfect world…. Equivalence point = Endpoint Our endpoint will be a little beyond the equivalence point since we have to see the color change

16. What is happening during the titration? We can analyze a titration curve. Take out the curve you completed for HW.

17. Think about this! Why is there a drastic change in the pH when 1.0 L of NaOH is titrated? Why does the pH stay constant before and after that point? What is the equivalence point ?

18. Now we can calculate the concentration of an unknown acid Mr. Klotz will walk you through a guided notes outline to complete the titration calculation. Problems not completed in class will become your homework.