1. Acid, Base, or Neutral

2. Today You Will… Define acid and base
Determine if a substance is acidic or basic
Explore why we learn about acids and bases

3. Why Learn about Acids & Bases?
What do you think is the pH level of NYC tap water?
The pH of a swimming pool must be checked periodically. Why?
Is it important for Lakes & Rivers to maintain a certain pH?

4. Arrhenius Acids and Bases
Acids produce H+ in aqueous solutions
water
HCl H+(aq) + Cl- (aq)
Bases produce OH- in aqueous solutions
NaOH Na+(aq) + OH- (aq)
LecturePLUS Timberlake

5. LecturePLUS Timberlake
Acids
Produce H+ (as H3O+) ions in water
Produce a negative ion (-) too
Taste sour
Corrode metals
React with bases to form salts and water
LecturePLUS Timberlake

6. LecturePLUS Timberlake
Bases
Produce OH- ions in water
Taste bitter, chalky
Feel soapy, slippery
React with acids to form salts and water
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7. LecturePLUS Timberlake
Learning Check AB1
Describe the solution in each of the following as: 1) acid 2) base or 3)neutral.
A. ___soda
B. ___soap
C. ___coffee
D. ___ wine
E. ___ water
F. ___ grapefruit
LecturePLUS Timberlake

8. LecturePLUS Timberlake
Solution AB1
Describe each solution as:
1) acid 2) base or 3) neutral.
A. _1_ soda
B. _2_ soap
C. _1_ coffee
D. _1_ wine
E. _3_ water
F. _1_ grapefruit
LecturePLUS Timberlake

9. LecturePLUS Timberlake
Learning Check AB2
Identify each as characteristic of an A) acid or B) base
____ 1. Sour taste
____ 2. Produces OH- in aqueous solutions
____ 3. Chalky taste
____ 4. Is an electrolyte
____ 5. Produces H+ in aqueous solutions
LecturePLUS Timberlake

10. pH pH is a measure of how acidic or basic a solution is.
A pH of a solution depends on the concentration of hydrogen (H+).
The pH scale ranges from 0 to 14.
Acids range from 0-7.
Bases range from 7-14.
7 is neutral.

11. Indicators
An indicator is a compound (dye) that changes color in an acid or base or in both.

12. Indicators

13. pH of common household solutions
Lemon juice -2.2
Soda
Milk- 6.4
Distilled water- 7
Baking soda- 8.3
Ammonia-11.0