1. Drill
If I want to make a 2.3M solution of NaCl in 893mL of water, how many grams of NaCl do I need to add?

2. Answer
120 g NaCl

3. Drill – Take 2
If I have a concentrated solution of 15.0M solution in 3.0L of water, how much water do I need to add to make a 9.5M solution?

4. Answer
1.7 L

5. Agenda Drill Reading on Acids and Bases Look at pH paper
Browsted-Lowry Acids and Bases
Exit Slip
Looking Forward

6. Bronsted-Lowry Theory
Acid is any substance that donates a proton (H+)
Base is any substance that can accept protons

7. Proton Transfer Reactions
Pairs of compounds are related to each other
Known as acid-base pairs
Acid has a conjugate base
Base has a conjugate acid

8. Substances that can act as either an acid or a base
Amphoteric
Substances that can act as either an acid or a base

9. Upcoming… Wednesday Looking closer at pH pH and pOH calculations
Friday
Neutralization
Titration Lab
Monday/Wednesday/Friday – Time to complete Review Packet

10. A/B: NH3 + H2O  NH4+ + OH- Conjugate: H2SO4 + NH3  HSO4- + NH4+

11. Arrhenius Acids and Bases
Acids dissociate in water to produce hydrogen ion H+
Bases dissociate in water to give hydroxide ions, OH-

12. Many substances do not contain OH- but still act like a base
Arrhenius Problem
Many substances do not contain OH- but still act like a base