1. Bellwork

2. Concentrations of Solutions

3. Solute vs. Solvent
Concentration- measure of the amount of solute that is dissolved
Dilute- contains small amount of solute
Concentrated- contains large amount of solute

4. Molarity (M) M = moles of solute/ liters of solution
Liters is total volume, not just volume of solvent

5. Practice
5.2 moles of sugar are dissolved in 9.82 L of water. What is the molarity?
5.2/9.82= 0.53 M

6. Saline solutions are given to patients in a hospital
Saline solutions are given to patients in a hospital. One saline solution contains 90.0 g NaCl in exactly 100. mL of solution. What is the molarity of the solution?

7. A solution of NaCl has a molarity of 2. 8 M
A solution of NaCl has a molarity of 2.8 M. The solution has a volume of 250 mL. How many grams of NaCl are in this solution?

8. Molality (m)

9. [coca cola]

10. Another way to express concentration
NOT THE SAME AS MOLARITY!
m= moles solute/ kg solvent

11. Practice
What is the molality of a solution that contains 3.5 moles of CaCl2 in 2.25 kg of water?

12. How many grams of KI must be dissolved in 500
How many grams of KI must be dissolved in g of water to produce a molal KI solution?