2. Catalyst 1. What is the equilibrium point? 2. What exactly does equilibrium mean? 3. Can you find a situation in your body where this exists? 4. Grade yourselves in your learning logs for all LT’s End

3. LECTURE 6.6 – INTRO TO BUFFERS

4. 6.8 – I can identify the conjugate acid and base in a chemical reaction. 6.9 – I can explain what a buffer is, draw a titration curve for a buffered solution, and explain why these are essential to maintaining life in humans. Today’s Learning Target

5. What are conjugate acids and bases?

6. Conjugate Base – The compound that remains after a Bronsted-Lowry acid has given off its H +. Conjugate Acid – The compound that is formed when a Bronsted-Lowry base gains a H +. HA + B  A - + BH + I. Conjugate Acids and Bases

7. Identify the acid, base, conjugate acid, and conjugate base: HBr + NaOH  H 2 O + NaBr Class Example

8. Identify the acid, base, conjugate acid, and conjugate base: H 2 SO 4 + KOH  KHSO 4 + H 2 O Table Talk

9. Identify the acid, base, conjugate acid, and conjugate base: HI + NH 3  NH 4 + + I - Stop and Jot

10. What is equilibrium?

11. Weak acids and bases do not completely dissociate. This means that they exist in equilibrium There are both reactant and products present in a solution of weak acid or base. I. Weak Acid and Base Equilibrium

12. Equilibrium

13. SUMMARIZE

14. Learning Log Assessment Rate yourself 1 – 4 on LTs 6.8 and 6.9

15. Which Card? Raise your table’s card in the air for the category that you think each compound belongs to. Your choices are: 1.Bronsted – Lowry Acid 2.Bronsted – Lowry Base 3.Arrhenius Acid 4.Arrhenius Base 5.Conjugate Acid 6.Conjugate Base

16. Which Card? You run the following reaction: HCOOH + OH -  COOH - + H 2 O 1. What is OH - ? 2. What is HCOOH? 3. What is COOH - 4. What is H 2 O?

17. Which Card? You run the following reaction: NH 3 + HBr  NH 4 + + Br - 1. What is NH 3 ? 2. What is HBr? 3. What is NH 4 + ? 4. What is Br - ?

18. Which Card? You run the following reaction: HF + LiOH  LiF + H 2 O 1. What is LiOH? 2. What is HF? 3. What is LiF? 4. What is H 2 O?

19. Review Stations Rotate between the 8 stations (9 for honors) ROTATE! Station 1 – LT 6.1 Station 2 – LT 6.2 Station 3 – LT 6.3 Station 4 – LT 6.4 Station 5 – Calculating logs Station 6 – LT 6.5 Station 7 – LT 6.6 Station 8 – LT 6.6 Honors Station 9 – LT 6.8 and 6.9

21. Closing Time Test on Friday Rough Draft of Lab Report due Tuesday