1. 7-5.6
Distinguish between acids and bases and use indicators to determine their pH.

2. Acids Can be idenitified by their sour taste
Examples: lemons ,oranges, grapefruits, and limes
Reacts with metals
Turns blue litmus red

3. Bases Can be identified by their bitter taste and slippery feel
Examples: Milk of Magnesia, ammonia
Bases turn red litmus blue

4. Turns blue litmus red Turns red litmus blue Test for Acids or Bases

5. Litmus paper Blue litmus paper turns red in an acid.
Blue litmus paper stays blue in a base
Red litmus paper turns blue in a base.
Red litmus paper stays red in an acid.
RED ACID
BLUE BASE
Purple in a solution that is neutral

6. Properties of Acidic Solutions
Sour taste
Conduct electricity- some batteries contain acids
Corrosives (break down certain substances) corrode fabric,skin, and paper
Some react strongly with metals- leaving holes in the metal

7. Properties of Bases Most soaps are bases- feel slippery
Bases are corrosives like acids
They can cause burns and damage body tissue
Bases can conduct electricity like acids
They are not as corrosive to metals as acids.

8. Acids Vinegar- used in salad dressings
Citrus fruits ( contain Vitamin C)
Ants that sting inject acids
Hydrochloric acid- used to remove impurities from the surface of metals- Clean mortar from brick walls
Used to make fertilizers, dyes, and plastic

9. Bases Used in plastics, soaps, ammonia, and other cleaning products
Lime- used to mark lines on athletic fields and can make soil less acidic

10. What is pH? pH is a way to measure how acidic and basic a solution is.
pH scale ranges from 0-14 with pH 7 being neutral
Each pH unit is a change in acidity that is multiple of 10.
An acid with a pH scale of 2 is 10 times stronger than a acid with a pH of 3 and 100 times stronger than an acid with a pH of 4.