1. SOLUTIONS AND PRECIPITATES What mixes, what doesn’t and Why

2. MIXTURES: 1 + 1 = 2 or Does It? Add 50 mL of H 2 O to 50 mL of H 2 O ⃗ 100 mL Mixture Add 50 mL of H 2 O to 50 mL of MeOH i.e Water + Methanol (Methyl Alcohol) ⃗ ?? mL Mixture. WHY?

3. IONIC SPECIES IN SOLUTION

5. IMAGING INTERNAL X- RAYS Need DENSE material to Block X- Rays (BaSO 4 ) 2BaCl + Na 2 SO 4 → Ba 2 SO 4 + 2NaCl Note: Ba 2 SO 4 is VERY INSOLUBLE in WATER

6. DISAPPEARING ORANG E REACTION: Now You See It, Now You Don’t ! Solution A – Potassium Iodide (KI) in H 2 O Solution B – Mercuric Chloride (HgCl 2 ) in H 2 O

7. DISAPPEARING ORANG E REACTION: Now You See It, Now You Don’t ! Questions: 1.Is this a REDOX Reaction? 2.How can you explain the disappearance of the Orange Color?

8. DISAPPEARING ORANG E REACTION: Now You See It, Now You Don’t ! 1.Hg 2+ + 2I - ⇒ HgI 2 (Orange) 2.2. HgI 2 + 2I - ⇒ HgI 4 2- (Colorless)

9. MIXTURES: 1 + 1 = 2 or Does It? Add 50 mL of H 2 O to 50 mL of H 2 O ⃗ 100 mL Mixture Add 50 mL of H 2 O to 50 mL of MeOH i.e Water + Methanol (Methyl Alcohol) ⃗ ?? mL Mixture.