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Launch: 1/25
  Grab your binder and immediately take a seat!
  Place launch paper and Friday’s practice questions on
  y...
Launch: 1/25
  Grab your binder and immediately take a seat!
  Place launch paper and Friday’s practice questions on
  y...
Launch: 1/25
  Grab your binder and immediately take a seat!
  Place launch paper and Friday’s practice questions on
  y...
Launch: 1/25
  Grab your binder and immediately take a seat!
  Place launch paper and Friday’s practice questions on
  y...
Launch 1/25
1.  Draw a picture of
   •  HCl (a strong acid) dissolved in water
   •  HF (a weak acid) dissolved in water
Launch 1/25
2.  In a complete sentence, describe the difference
   between strong and weak acids. (Hint: use the
   word “...
Launch 1/25
3.  In the equation, HSO4- + H2O  H2SO4 + OH-,
   which reactant molecule acts as the base?
  a.  HSO4-
  b. ...
Announcements
  Unit #6 Exam this Thursday!
    Ask questions
    Work with purpose

  Class rules I am focusing on th...
January Calendar




            Exam
What is pH?
   Mr. Heffner
    1/25/10
Review: What are strong
        acids/bases?
  strong acid + strong base = water + a salt
    neutralize each other (pH ...
What is pH?
  pH is…
    the concentration of H+ ions in a solution

                pH = - log( H+ )
                  ...
What is pH?
  The pH scale is not linear
    it is logarithmic

                 pH = - log( H+ )
  Meaning…
    1 pH ...
What is pH?
  For each 1 pH unit difference, add a “0”

stomach acid (pH 1)
               is 10X more acidic than
      ...
Whiteboards
  Work in pairs
    Trade-off marker every question
  Partner without the marker should be checking
  work ...
Lemon juice (pH 2)
      Soda (pH 4)

Which is more acidic and by how much?
Ammonia (pH 10)
      Water (pH 7)

Which is more basic and by how much?
Rainwater (pH 5)
        10M HCl (pH 0)

Which is the stronger acid and by how much?
Bleach (pH 12)
      Baking soda (pH 9)

Which is the stronger base and by how much?
Tomato
               Lemon
Which is the stronger acid and by how much?
Banana
                Soap
Which is the stronger base and by how much?
Rainwater
 Pure water
Which is the stronger
acid and by how much?
Drain cleaner
  Egg whites
 Which is the stronger
base and by how much?
Practice Questions
  Practice question worksheet
Binder
  Re-label your tabs:
1.  Launches
2.  Notes
3.  Practice Questions
4.  Handouts/Labs
5.  Grades
Exit Slip
1.  pH is a measure of
  a.    the taste of an acid or a base.
  b.    the ability of a solute to dissolve in so...
Exit Slip
2.  The pH scale is
  a.  logarithmic, meaning that 1 pH unit equals ten times
      the acidity/basicity
  b.  ...
Exit Slip
3.  Of the four different laboratory solutions below,
   the solution with the highest acidity has a pH of
  a. ...
Exit Slip
4.  How many times more basic is drain cleaner (pH
   12) than baking soda (pH 9)?
  a.  3
  b.  30
  c.  100
  ...
Exit Slip
5.  How many times more
   acidic is stomach acid than
   rainwater?
  a.  4
  b.  10000
  c.  40000
  d.  100000
Homework
  Finish practice questions
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1 25 What Is P H

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1 25 What Is P H

  1. 1. Launch: 1/25   Grab your binder and immediately take a seat!   Place launch paper and Friday’s practice questions on your desk.   Friday’s Quiz Data: 94%!   Today’s Objective: I can use the pH scale to characterize acid and base solutions.
  2. 2. Launch: 1/25   Grab your binder and immediately take a seat!   Place launch paper and Friday’s practice questions on your desk.   Friday’s Quiz Data: 89%!   Today’s Objective: I can use the pH scale to characterize acid and base solutions.
  3. 3. Launch: 1/25   Grab your binder and immediately take a seat!   Place launch paper and Friday’s practice questions on your desk.   Friday’s Quiz Data: 95%!   Today’s Objective: I can use the pH scale to characterize acid and base solutions.
  4. 4. Launch: 1/25   Grab your binder and immediately take a seat!   Place launch paper and Friday’s practice questions on your desk.   Friday’s Quiz Data: 94%!   Today’s Objective: I can use the pH scale to characterize acid and base solutions.
  5. 5. Launch 1/25 1.  Draw a picture of •  HCl (a strong acid) dissolved in water •  HF (a weak acid) dissolved in water
  6. 6. Launch 1/25 2.  In a complete sentence, describe the difference between strong and weak acids. (Hint: use the word “dissociation”)
  7. 7. Launch 1/25 3.  In the equation, HSO4- + H2O  H2SO4 + OH-, which reactant molecule acts as the base? a.  HSO4- b.  H2O c.  H2SO4 d.  OH-
  8. 8. Announcements   Unit #6 Exam this Thursday!   Ask questions   Work with purpose   Class rules I am focusing on this week:   interfering with your own or someone else’s learning   leaving seat without permission
  9. 9. January Calendar Exam
  10. 10. What is pH? Mr. Heffner 1/25/10
  11. 11. Review: What are strong acids/bases?   strong acid + strong base = water + a salt   neutralize each other (pH 7) an ionic compound HI + KOH  ? H+ + l- + K+ + OH-  ? 2O + KI H a salt water
  12. 12. What is pH?   pH is…   the concentration of H+ ions in a solution pH = - log( H+ ) the molarity function on H+ ions of a calculator (mol/L)
  13. 13. What is pH?   The pH scale is not linear   it is logarithmic pH = - log( H+ )   Meaning…   1 pH unit = 10 times the acidity stomach acid (pH 1) is 10X more acidic than lemon juice (pH 2)
  14. 14. What is pH?   For each 1 pH unit difference, add a “0” stomach acid (pH 1) is 10X more acidic than 1000X more acidic than 100X more acidic than lemon soda (pH 3) vinegar (pH 2) juice 4) Three“0”s b/c pH Two “0”s b/c pH difference = 2 difference = 3   This is because the pH scale is logarithmic!
  15. 15. Whiteboards   Work in pairs   Trade-off marker every question   Partner without the marker should be checking work at each step!   You have 60 seconds to answer the question   Which is more more acidic/basic?   How much more acidic/basic?   Lift board only when prompted
  16. 16. Lemon juice (pH 2) Soda (pH 4) Which is more acidic and by how much?
  17. 17. Ammonia (pH 10) Water (pH 7) Which is more basic and by how much?
  18. 18. Rainwater (pH 5) 10M HCl (pH 0) Which is the stronger acid and by how much?
  19. 19. Bleach (pH 12) Baking soda (pH 9) Which is the stronger base and by how much?
  20. 20. Tomato Lemon Which is the stronger acid and by how much?
  21. 21. Banana Soap Which is the stronger base and by how much?
  22. 22. Rainwater Pure water Which is the stronger acid and by how much?
  23. 23. Drain cleaner Egg whites Which is the stronger base and by how much?
  24. 24. Practice Questions   Practice question worksheet
  25. 25. Binder   Re-label your tabs: 1.  Launches 2.  Notes 3.  Practice Questions 4.  Handouts/Labs 5.  Grades
  26. 26. Exit Slip 1.  pH is a measure of a.  the taste of an acid or a base. b.  the ability of a solute to dissolve in solution. c.  the concentration of H+ ions in solution. d.  the strength of an ion in solution.
  27. 27. Exit Slip 2.  The pH scale is a.  logarithmic, meaning that 1 pH unit equals ten times the acidity/basicity b.  logarithmic, meaning that 1 pH unit equals one times the acidity/basicity c.  linear, meaning that 1 pH unit equals ten times the acidity/basicity d.  linear, meaning that 1 pH unit equals one times the acidity/basicity
  28. 28. Exit Slip 3.  Of the four different laboratory solutions below, the solution with the highest acidity has a pH of a.  11. b.  7. c.  5. d.  3.
  29. 29. Exit Slip 4.  How many times more basic is drain cleaner (pH 12) than baking soda (pH 9)? a.  3 b.  30 c.  100 d.  1000
  30. 30. Exit Slip 5.  How many times more acidic is stomach acid than rainwater? a.  4 b.  10000 c.  40000 d.  100000
  31. 31. Homework   Finish practice questions

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