1. Warm Up – March 28, 2018
COPY QUESTIONS AND ANSWERS INTO NOTEBOOK! 1. The attraction between water molecules – adhesion or cohesion? 2. The substance that does the dissolving – solute or solvent 3. Two liquids that are soluble in each other – miscible or immiscible 4. A substance that does not dissolve in a solvent – soluble or insoluble 5. 2 or more substances mixed and you cannot tell them apart – homogenous or heterogeneous? 6. What do we call the attraction between particles – alloy or polarity

2. Dissociation and Solvation

3. DISSOCIATION: separation of molecules or ions of solute
Ex. NaCl → Na Cl-
compound
IONS

4. SOLVATION: solvent particles surround solute particles
Draw
these

5. (surface area)
(agitate)
Polar/nonpolar

6. Electrolyte
vs.
Nonelectrolyte

7. Draw/label this picture in the space to the right of your definition
ELECTROLYTE- aqueous solution that conducts electricity (ions move around freely-ionic or acidic compounds)
Draw/label this picture in the space to the right of your definition

8. Draw/label this picture in the space to the right of your definition
NONELECTROLYTE- aqueous solution that does NOT conduct electricity (no ions-covalent compounds)
Draw/label this picture in the space to the right of your definition

9. Demo: C12H22O11 vs. 2 NaCl solutions
(They contain different amounts of NaCl dissolved in water)
Draw each set-up

11. temperature and pressure (gases only)
SOLUBILITY- amount of solute that will dissolve in a certain amount of solvent at a specific
temperature and pressure (gases only)
(under the line)
Unsaturated-solution could hold more solute; below the line
Saturated-solution has ‘just the right’ amount of solute; on the line
Supersaturated-solution has ‘too much’ solute dissolved in it; above the line *ROCK CANDY*

12. How much solute will dissolve?
A solubility curve shows the amount of each solute that will dissolve in 100g H20 at each temperature.
Saturated is on the line.
Unsaturated is below the line.
Supersaturated is above the line.
Saturated
Grams solute/100 g H2O

13. How much NaClO3 would you have to add to 100 g of water at 50oC to make a saturated solution?
Look at the intersection.
Grams solute/100 g H2O

14. What is the solubility of KNO3 at 60 oC in 200 g of H2O?
Grams solute/100 g H2O
NaClO3
KNO3
KBr
NaCl
Temperature
What is the solubility of KNO3 at 60 oC in 200 g of H2O?
How many grams of KBr can dissolve in 50 grams of H2O at 100 oC?

16. Factors that affect Solubility
1. type of solute or solvent (like dissolves like)
Ionic solutes tend to dissolve in polar solvents
but not in nonpolar solvents
Molecular solutes tend to dissolve in nonpolar
solvents.
2. Temperature
Direct
Indirect
Solid/liquid relationship?
Gas relationship?
3. Pressure
No effect
Solid/liquid relationship?
Gas relationship?
Indirect

17. REVIEW video https://www. youtube. com/watch