1. Bellwork
1.)Come up with 2-3 things you know about Acids and Bases
2.) Can you come up with some examples of an acid? Base?
3.) Where have you seen it in real life?
4.) When would they be useful to us? When might they be harmful to us?

2. Agenda
Bellwork
Objective: differentiate the properties of an acid and base.
Key Points
Brain Pop
Reading Notes
Independent practice.

3. Why is this important in LIFE?
Questions that can be answered by learning about acids and bases.
Why do you get more cavities from drinking soda?
Buffers
Important in your body
How do you know your swimming pool safe to swim in?

4. Acids:
Definition: any compound that increases the number of Hydronium ions.
Produce H+ (as H3O+) ions in water (the hydronium ion is a hydrogen ion attached to a water molecule)
Taste sour
Corrode metals
React with metals to give off hydrogen gas
Conduct Electricity

5. Ahhhhh… Although most acids are harmless, some are harmful!
For example, some acids eat through plastic, clothing, skin and even corrode metal.
Sometimes these properties of strong acids are useful.
For example, hydrochloric acid in your stomach helps digest food.
Most acids are harmless, but some can be harmful!
Some can eat through through plastics, clothing, metals, or even skinSo, don’t touch acids you are unfamiliar with
These properties can be helpful though. For example, hydrochloric acid in your stomach helps digest food.

6. Examples of Common Acids
Sulfuric Acid - Car Battery
Hydrochloric Acid - Stomach Acid
Phosphoric Acid - Cold Drinks
Lactic Acid - Milk
Citric Acid - Oranges and Lemons
Acetic Acid - Vinegar

7. Bases
PROPERTIES of
Definition: any compound that increases the number of hydroxide ions
Properties of bases:
Produce OH- (hydroxide) ions in water
Soapy/slippery feel
Bitter, chalky taste
Conducts Electricity

8. Some Examples of Bases Ammonia - Household cleaners
Sodium Hydroxide - Drano
Sodium Bicarbonate - Baking Soda
KOH potassium hydroxide liquid soap
Mg(OH)2- magnesium hydroxide-“MOM” Milk of magnesia
Al(OH)3 -aluminum hydroxide- Maalox (antacid)

9. BrainPop-Acids and Bases

10. Acid or Base?

11. Acid or Base?

12. Reading Notes: Please read the reading notes at your tables.
Work together to answer the questions using your key points and your reading notes together.
Move on to INDEPENDENT PRACTICE.

13. Bellwork

14. Agenda
Bellwork
Objective: SWBAT use the pH scale to identify a substance as an acid or base.

15. pH Scale
The pH scale is used to express the strength of acids and bases solutions. It ranges from 1-14.
Acids have a pH less than 7
Bases have a pH more than 7
Nuetral solutions have a pH of exactly 7

16. pH of Common Substances

17. Check for Understanding
Choose acid or base for the following: 1. pH=12 2. bitter taste 3. slippery 4. pH=2

18. Well, what is pH?
pH is a measure of how many hydronium (H30+) and hydroxide (OH-) ions are in a solution
Remember, an acid produces hydronium (H30+) ions when it dissolves in water
A base produces hydroxide ions (OH-) when dissolved in water

19. Weak vs. Strong The stronger a base is, the higher the pH
The stronger an acid is, the lower the pH
As we move closer to 7 from either direction, acids and bases become weaker and more neutral

20. What does that mean? An acid is STRONGER if it is a LOWER pH
pH=1 is stronger than pH=3
A base is STRONGER if it has a HIGHER pH
pH=12 is stronger than pH=10

21. Practice Which is a stronger acid? Which is a weaker base?
A) pH=4
B) pH=5
Which is a weaker base?
A) pH=10
B) pH=14
Which is a stronger base?
A) pH=12
B) pH=13

22. Chemical Formulas of Acids and Bases
The chemical formulas of acids generally start with H (or hydrogen)
Ex: HCl is hydrochloric acid, an acid found in the human stomach
H2SO4-sulfuric acid, an acid found in car batteries
Many bases have chemical formulas that end in OH

23. Acid and Bases

24. Acid and Bases

25. Water is amphoteric (can act as an acid or a base!!!)
Interesting fact…
Water is amphoteric (can act as an acid or a base!!!)