1. Objectives: Catalyst: Homework: Page 83, 17-22
I can classify a solution based on its pH.
I can list some physical properties of acids and bases.
I know the role of H+ and OH- in pH and know how the pH scale changes with H+ concentration.
Catalyst:
How would you know is something was acidic? Basic? Neutral?
Which type of solution would you rather drink, an acid or a base? Why?
Homework: Page 83, 17-22

2. pH What do you already know? Low pH means acidic
High pH means basic/alkaline
7 is neutral

3. pH Mini-lab
You and your table partners are going to test a number of household items using pH strips.
Before you start, make a prediction about the pH of each item.
Is it a….
Strong acid
Weak acid
Neutral
Weak base
Strong base
You need to figure out a way to organize your data. The strips themselves can be part of your data table.

4. pH Mini-lab Sodium Hydroxide Hydrochloric acid Alka-seltzer Pepsi
Sierra Mist
Soap
Rubbing alcohol
Baking soda

5. Read C.9
Acids
Bases
Similarities

6. C.9 pH
What is pH? - measure of the acidity of a solution - scale is from 0 to is very acidic - 14 is very alkaline/basic - 7 is neutral - every step on the scale is 10 times more than the previous step - 5 is 10x more acidic than is 100x more acidic than is 1,000x more acidic than 6

7. C.9 pH
What does pH mean? - pH is the “power of hydrogen” - OH– and H+ ions in solution change the pH - acids create more H+ in solution - HCl, HNO3, H­2SO4 - bases create more OH– in solution - Ca(OH)2, KOH, NaOH - pH gives the concentration of H+ ions in solution - more H+ means more acidic, lower pH - more OH- means more basic, higher pH

8. C.9 Acids and Bases Acid + Base = a neutralization reaction Bases
Corrosive
Taste bitter
Feel slippery
React with oils and greases
Acids
Corrosive
Taste sour
Feel sticky
React with metals
Acid + Base = a neutralization reaction