1. Acids/Bases and the pH Scale

2. Properties of Acids and Bases
Taste sour
Taste Bitter
Turns blue litmus paper red
Turns red litmus paper blue
Reacts with metals
Produces Hydroxide ions (OH-) in water
Produces Hydrogen ions (H+) in water
Feels Slippery
Reacts with carbonates to produce
CO2 gas

3. Acid, Base, Neutral, or Both (Acid and Base)
1. pH of 7 _______________________________
2. ammonia _____________________________
3. fluid in the stomach ____________________
4. produces hydrogen gas __________________
5. NaOH or KOH _________________________
6. saliva in the mouth ______________________
7. conduct electricity ______________________
8. pH 0 – 6.9 ______________________________
9. vinegar ________________________________
10. pH ______________________________
11. HCl ___________________________________
12. produce ions in water ______________________

4. Answers 1. neutral 10. base 2. base 11. acid 3. acid 12. both 4. acid

5. 1. An ________ is a compound that changes color in the presence of an acid or base.
2. This property of an acid can “eat away” certain metals_____________
3. The ________ is a series of numbers that indicates the concentration of hydrogen ions in a solution.
4. A _______ is an ionic compound that forms from the reaction of an acid and a base.
Vocabulary

6. 5. At a pH near ________ stomach enzymes break down proteins.
6. During the neutralization process _______ and ________ is produced.
7. The process that breaks down complex molecules of food into smaller molecules is called________.
8. ____________ is the reaction between an acid and a base.
9. _________ digestion is a physical process in which large pieces of food are torn and ground into smaller pieces.
10. Most chemical digestion is completed in the ___.

7. Vocabulary Answers 1. indicator 2. corrosive 3. pH scale 4. salt
5. 2 (two)
6. salt and water
7. digestion
8. Neutralization
9. Mechanical
10. small intestines

8. pH Scale
Range 0 – 14
Acids 0 – 6.9 (lower the number, stronger the acid)
Bases 7.1 – 14 (higher the number, stronger the base)
Neutral 7

9. Acid / Base Reactions Bases in water produce?
Acids in water produce?
1. HCl
Bases in water produce?
2. NaOH
Acids and bases (neutralization) produce?
3. HCl NaOH

10. Acid / Base Reaction Answers
1. H Cl-
2. Na OH-
3. H2O Na Cl-

11. More Practice! HCl + KOH  HF  LiOH  HF + LiOH  HBr  KOH 
HCl + LiOH 

12. Answers HCl + KOH  KCl + H2O HF  H+ + F- LiOH  Li+ + OH-
HF + LiOH  LiF + H2O
HBr  H+ + Br-
KOH  K+ + OH-
HCl + LiOH  LiCl + H2O