1. Solutions Part II: Concentration Units

2. Percent solutions

3. Parts per million 1 mg/kg, or 1 mg/L

4. Parts per million 1 mg/kg, or 1 mg/L

5. Parts per billion 1 g/billion grams, or 1  g/L

6. Parts per billion 1 g/billion grams, or 1  g/L

7. Mole fraction Do you need the mole fraction of the SOLUTE or the SOLVENT? Be careful!

8. Molarity Recall from chapter 4:

9. Molarity, M Recall from chapter 4: Volume can change with temperature…so molarity is temperature dependent!

10. Molality, m

11. Mass doesn’t depend on temperature— so molality is independent of temperature!

12. Problems A solution is prepared by dissolving 34.8 g of NaCl in water and bringing the mixture to a final volume of 675 mL. Calculate the molarity.

13. Problem Calculate the molality of a solution prepared from 43.3 g of glucose dissolved in 832 g of water.