1. Explain a detergent molecule; describe how it has 2 distinctive parts.
Daily Starter 1/6
Explain a detergent molecule; describe how it has 2 distinctive parts.

2. II. Strength of Acids & Bases Strong vs. Weak pH

3. Neutral Water
Because [H+] = [OH-], pure water is neutral

4. Acidic
In an acidic solution:
[H+] > [OH-]

5. Basic
In a basic solution:
[H+] < [OH-]

6. Acids and bases can be classified as either strong or weak
Strong: ionizes (dissociates) completely in H2O
Weak: only partially ionizes (dissociates) in H2O

7. 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 - +

8. Strong Strong Acid: HCl  H+ + Cl- Strong Base: NaOH  Na+ + OH-
Complete dissociation – all HCl and NaOH molecules break apart into ions. This is represented by a single-headed arrow.

9. WEAK Weak Acid: HCN H+ + CN- Weak Base: NH3 NH4+ + OH-
Only some of the HCN and NH3 molecules break apart into ions. The reversible arrows represent a mixture of reactants and products in equilibrium.

10. 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

11. pH of Common Substances
B. pH Scale
pH of Common Substances

12. ConcepTest
Which of the following "molecular" pictures best represents a concentrated solution of the weak acid HA? A B

13. ConcepTest
Which of the following "molecular" pictures best represents a concentrated solution of the weak acid HA? A B

14. Conjugate Acid/Base
Conjugate acid or base is generally the product of the reaction (right side of rxn)
**In-class work to show conjugate acid/base