1. Do Now
Name 3 things that come to your mind when you think of acids and bases.
Name any acids or bases that you know of.

2. Acids and Bases

3. Objectives SWBAT distinguish between an Acid and a Base
SWBAT describe the relationship between pH & the strength of an acid

4. Acids sour taste High concentration of H+ ions conduct electricity
(good conductor  strong acid, weak conductor  weak acid)
react with bases to form water and a salt
pH of 1-6, the lower the pH the stronger the acid
Example  lemon juice

5. Bases Also called “alkaline” bitter taste, soapy feel
High concentration of OH- ions
conduct electricity
(good conductor  strong base, weak conductor  weak base)
react with acids to form water and a salt
pH of 8-14, the higher the pH the stronger the base
Example  baking soda

6. What are some tests you could do to figure out whether a compound is an acid, abase, or neither?

7. Acid/Base Tests Touch / Taste
Conductivity test (to see if it is weak or strong)
pH paper or pH probe

8. Everything in the world has a pH – either it is acidic, basic, or neutral
#8.1 Aim:
What are acids and bases?
Agenda
QOD (5)
Lesson: acid and bases (15)
Activity:
Acid or base? (15)
Summary (5)
No HW

9. pH Scale Ranges from 1-14 pH 7 is neutral
pH below 7 is acidic. The closer to 1, the more acidic.
pH above 7 is basic. The close you get to 14, the more basic.

10. pH = - log [H+] pH Scale [H+] = concentration of hydrogen ions.
[H+] = 10-9 would give pH 9 (base).
[H+] = 10-3 would give pH 3

11. Checks for Understanding
What is the hydrogen ion concentration in a solution with a pH of 8.0?
8 x 10-1M H+
1 x 10-6M H+
1 x 10-7M H+
1 x 10-8M H+

12. Checks for Understanding
Which pH indicates a solution that has the highest concentration of OH- ions? 2 4 8 6

13. Checks for Understanding
Which represents the most acidic substance?
Apple Juice (pH = 3.0)
Black Coffee (pH = 5.0)
Hand Soap (pH = 10.0)
Household Ammonia (pH = 12.0)

14. Checks for Understanding
Which is not a property of an acid?
conducts electricity
reacts with metals
corrosive
taste bitter

15. Independent Practice

16. Exit Slip: Acids and Bases
Is citrus usually acidic or basic?
Are household cleaners usually acidic or basic?
Is NaOH going to be an acid or a base?
A substance has a pH of 9. Is this substance an acid or base?
Water is considered neutral. What pH is neutral?

17. Exit Ticket Answers Acidic Basic Base 7
Is citrus usually acidic or basic?
Are household cleaners usually acidic or basic?
Is NaOH going to be an acid or a base?
A substance has a pH of 9. Is this substance an acid or base?
Water is considered neutral. What pH is neutral?
Acidic
Basic
Base 7

18. Closing Procedures Due Today Home Learning
Independent Practice Worksheet
Exit Slip
Read pgs
Chem to Go on page 212
Answer Problems #1-11