5. Solutions Not all solutes dissolve readily in solvents, there are a few things that affect the rate of dissolution Those 3 factors are: Surface Area Agitation Temperature
6. Surface Area If we increase the surface area of our solute, that will help speed up the dissolution process. When you crush up the solute, there are more points of contact between the solute and the solvent. Because there are more points of contact it will dissolve quicker.
8. Which has more points of contact between the solute and solvent?
9. Agitation Also if we agitate or stir the solution, it disperses the solute and brings fresh solvent into contact with the solute’s surface. http://www.youtube.com/watch?v=cF55VAk1Nlk
10. Temperature One of the most important factors of solubility is temperature. Which dissolves quicker, sugar in HOT tea or sugar in COLD, ice tea? (Write your answer on your notes…)
11. Temperature The reason for that is the temperature. Remember temperature is a measure of the average kinetic energy of a substance, in this case our solvent. The solvent particles are moving FASTER when we increase the temperature, therefore the HIGHER the temperature, the more collisions between solute and solvent.
13. SO…. What would be the best, most effective way to dissolve a sugar cube in a beaker of water? (Answer at the bottom of your notes…)
14. Solubility Have you ever put TOO much sugar in your tea? What happens?? If you keep adding sugar, at some point your solution will become saturated, which means there is more solute than solventand the extra sugar will remain undissolved on the bottom of your glass! You’ve maxed out the amount of solute per solvent at that particular temperature.
15. Solubility When you have a solution that contains the maximum amount of dissolved solute that is called? Saturated
16. Solubility A solution that contains less solute than a saturated solution is? UNsaturated
17. Solubility The solution contains more than the maximum amount of solute that can be dissolved in the solution. Supersaturated http://www.youtube.com/watch?v=HnSg2cl09PI
18. Solubility The solubility of a substance is the amount of that substance required to form a saturated solution with a specific amount of solvent at a specified temperature. For example, the solubility of sugar is 204 g per 100 g of water at 20°C
19. Solubility The way that scientists illustrate the solubility of solutes is by a solubility graph or solubility curve
20. Which solute is least affected by temperature? Which solute is MOST affected by temperature?
Editor's Notes
You can either show the youtube clip or do it yourself. I think I am going to do them as demos for my kids
