1. ACT Prep Passage V 5 minutes Start when the bell rings
WARM UP
ACT Prep
Passage V
5 minutes
Start when the bell rings

2. Concentrations of Solutions

3. Concentration Definition
Amount of solute in a quantity of solvent/solution

4. Basic Concentration Descriptions
Saturated solution
Maximum amount of dissolved solute
Unsaturated solution
Can dissolve more solute

5. Basic Concentration Descriptions
Supersaturated solution
More solute than can normally be dissolved
Increased temp.
Unstable
Crystallization

6. Mathematical Concentration Units
Percent by Mass
Mass of solute
Mass of solution
solution = solute + solvent
Unit: %
x 100

7. Mathematical Concentration Units
Mole Fraction
Moles of solute
Moles of solution
solution = solute + solvent
No unit

8. Mathematical Concentration Units
Molarity
Moles of solute
Liters of solution
solution = solute + solvent
Unit: M

9. Mathematical Concentration Units
Molality
Moles of solute
Mass of solvent (kg)
Unit: m

10. Chemistry and Math
All equations can be set up to find any unknown value
May need to convert to get to the unit you need for a formula

11. WRAP UP
Calculate both the % by mass and the mole fraction of a solution of 15 g Cu and 95 g Sn.
Calculate the molarity of a solution of 3 moles of HCl dissolved in 850 mL of solution.
Calculate the molality of a solution of .837 moles of sugar in 5.59 kg of water.

12. WARM UP
If you have a solution of 11.2 g of NaCl and g of H2O (d=1.0 g/mL), that create 120 mL of solution when mixed, calculate:
% by mass
mole fraction

13. WRAP UP
If you have a solution of 11.2 g of NaCl and g of H2O (d=1.0 g/mL), that create 120 mL of solution when mixed, calculate:
molality
molarity

14. WARM UP
The molality of a solution of chlorine and water is m. This solution contains 3500 g of water. How much chlorine, in grams, was used to prepare this solution?

15. WRAP UP
Which two measurements of concentration are most commonly used? Why is this?
Write the formula and unit for each.