1. Saturated Solutions and Solubility

2. Solubility Solubility: refers to the mass (how much in grams) of solute that can dissolve in a given amount of solvent to form a saturated solution at a given temperature Example: at 0°C you can dissolve 35.7g of salt in 100g of water

3. Solubility An “Unsaturated Solution” contains less solute than a saturated solution A “Saturated Solution” contains the maximum amount of solute that will dissolve in a solvent at a given temperature A “Supersaturated Solution” contains more solute than a saturated solution

4. Supersaturated Solutions You can make a supersaturated solution by making a saturated solution and then cooling that saturated solution without stirring it The excess solute will remain dissolved in the solution as long as it is not disrupted If you introduce any more solute the extra solute will become crystals

5. Supersaturated Solutions https://www.youtube.com/watch?v=qcpiDBya_Nw https://www.youtube.com/watch?v=KFO88CMfaFA

6. Solubility Curves We can graph and view how temperature increases the amount of solute that can be dissolved using a Solubility Curve

7. Solubility Curves The curved line represents the “SATURATION POINT” at a given temperature- or how many grams of solute dissolve in 100g of solvent All amounts above the curved line would be “supersaturated” Any amount below the curved line means the solution is “unsaturated”

8. Factors Affecting Solubility Pressure –↑ pressure of gas solute= ↑ solubility in liquid –Ex: high pressure of CO 2 in sealed pop bottle (supersaturated), opening bottle is like dropping crystal in, all the gas bubbles come out of the solvent Temperature –↑ temperature of solvent= ↑ solubility of solid –For a few substances the reverse occurs

9. Solubility Graph Practice Try the worksheet “Saturation and Temperature” 1.Graph the data from the table on the solubility graph 2.Answer questions 1-8 on a sheet of looseleaf

10. Solubility and Saturation- Simulation Lab http://www.glencoe.com/sites/common_as sets/science/virtual_labs/PS15/PS15.html http://www.glencoe.com/sites/common_as sets/science/virtual_labs/PS15/PS15.html Working in pairs, use a laptop to go to the following website to perform the virtual lab