1. Equilibrium - buffers Acid base equilibrium December 4, 2017
Learning Target: I CAN Define a buffer system and calculate pH and determine the changes in pH based on Ka and concentration of acids and bases

2. December 4, 2017
Do Now (4 min)
Learning target: I CAN define a buffer system and calculate pH and determine the changes in pH based on Ka and concentration of acids and bases
Do Now (Answer on your Do Now Sheet):
Do Now (on the board):
Predict the pH at each of the following points along a strong base weak acid titration, Ka = 10-5:
1) Only weak base present
2) A little strong base is added
3) At midpoint
4) At equivalence point
5) Excess base added
Learning Target: I CAN Define a buffer system and calculate pH and determine the changes in pH based on Ka and concentration of acids and bases

3. announcements December 4, 2017
Afterschool tutoring – every Wednesday 3 -4 PM
Learning Target: I CAN Define a buffer system and calculate pH and determine the changes in pH based on Ka and concentration of acids and bases

4. December 4, 2017
Buffers packet - pogil
Work in pairs to complete each section of the packet 01 02
Get teacher approval at each STOP SIGN 03
Discuss and collaborate to understand how to solve more challenging problems 04
Show all work on your worksheets
Learning Target: I CAN Define a buffer system and calculate pH and determine the changes in pH based on Ka and concentration of acids and bases

5. Exercise 6 part a-C (in pairs: 12 min)
December 4, 2017
Exercise 6 part a-C (in pairs: 12 min)
Learning Target: I CAN Define a buffer system and calculate pH and determine the changes in pH based on Ka and concentration of acids and bases

6. Ph Indicators! December 4, 2017
Color
pKIn
pH range
Acid
Base
Thymol Blue - 1st change
red
yellow
1.5
Methyl Orange
3.7
Bromocresol Green
blue
4.7
Methyl Red
5.1
Bromothymol Blue
7.0
Phenol Red
7.9
Thymol Blue - 2nd change
8.9
Phenolphthalein
colorless
magenta
9.4
Learning Target: I CAN Define a buffer system and calculate pH and determine the changes in pH based on Ka and concentration of acids and bases

7. December 4, 2017
Ph Indicators!
At a low pH, a weak acid indicator is almost entirely in the HIn form, the color of which predominates.
As the pH increases, the intensity of the color of HIn decreases and the equilibrium is pushed to the right.  Therefore, the intensity of the color of In- increases. 
An indicator is most effective if the color change is distinct and over a small pH range.  For most indicators the range is within ±1 of the pKln value.
Learning Target: I CAN Define a buffer system and calculate pH and determine the changes in pH based on Ka and concentration of acids and bases

8. Exercise 7 (in pairs: 8 min)
December 4, 2017
Exercise 7 (in pairs: 8 min)
Kb = 1.8 x 10-5
Learning Target: I CAN Define a buffer system and calculate pH and determine the changes in pH based on Ka and concentration of acids and bases

9. Exercise 8 (in pairs: 12 min)
December 4, 2017
Exercise 8 (in pairs: 12 min)
Learning Target: I CAN Define a buffer system and calculate pH and determine the changes in pH based on Ka and concentration of acids and bases

10. Video (11 Min) December 4, 2017 Take Notes
Learning Target: I CAN Define a buffer system and calculate pH and determine the changes in pH based on Ka and concentration of acids and bases

11. Titration curves December 4, 2017 Adding base to acid
Learning Target: I CAN Define a buffer system and calculate pH and determine the changes in pH based on Ka and concentration of acids and bases

12. Titration curves December 4, 2017 Adding acid to base
Learning Target: I CAN Define a buffer system and calculate pH and determine the changes in pH based on Ka and concentration of acids and bases

13. Titration curves (15 min)
December 4, 2017
Titration curves (15 min)
Practice questions 42 – 46 in pairs
Learning Target: I CAN Define a buffer system and calculate pH and determine the changes in pH based on Ka and concentration of acids and bases

14. December 4, 2017
Exit ticket (3 min)
On a separate sheet of paper: What is a buffer? What is it used for?
Learning Target: I CAN Define a buffer system and calculate pH and determine the changes in pH based on Ka and concentration of acids and bases