1. pH, Acids and Bases

2. pH? What is that??
pH: a measure of the acidity or basicity of an aqueous solution
The measure of hydrogen ions (these are positively charged)

3. Measuring pH A solution is “acidic” if the pH is less than 7
A solution is “basic” if the pH is more than 7

4. Measuring pH
pH scale- measures how acidic, basic, or neutral a substance is
Ranges from 0-14
pH of 7= neutral
pH of less than 7= acidic
pH of more than 7= basic

5. Basic

6. What does this have to do with water?
Pure water is neutral (pH=7)
When chemicals are mixed with water, the mixture can be acidic or basic
The pH of a sample of water determines its health and solubility

7. Acids Ex: vinegar and lemon juice High concentration of H ions
Become more acidic when added to water

8. Bases Ex: ammonia and baking soda Low concentration of H ions
Concentration of H ions is reduced when added to water

9. Lab activity Ammonia Distilled water Hydrochloric acid Lemon juice
Milk
Rubbing alcohol
Soda
Sodium Hydroxide
Vinegar

10. Common Items and their pH