1. Strength of Acids & Bases Strong vs. Weak pH

2. A. Strong vs. Weak Strong Acid/Base 100% ions in water
strong electrolyte
HCl, HNO3, NaOH, LiOH - +
Weak Acid/Base
few ions in water
weak electrolyte
HC2H3O2, NH3 - +

3. B. pH Scale pH a measure of the concentration of H3O+ ions in solution
measured with a pH meter or an indicator with a wide color range 7
INCREASING
ACIDITY
NEUTRAL
BASICITY 14

4. pH of Common Substances
B. pH Scale
pH of Common Substances

5. Concept Test
Which of the following "molecular" pictures best represents a concentrated solution of the weak acid HA? A B

6. Concept Test
Which of the following "molecular" pictures best represents a concentrated solution of the weak acid HA? A B

7. Concept Test Is the following statement TRUE or FALSE?
A strong acid has a lower pH than a weak acid.

8. Concept Test Is the following statement TRUE or FALSE?
A strong acid has a lower pH than a weak acid.
FALSE - Strong/weak refers to amount of ionization whereas pH refers to concentration of H+.