Homework 1.Register for Sapling 2.Register your clicker device (either clicker or smartphone) 3.Take Quiz 1 (in Blackboard due Fri 11:59 pm) 4.Learn.

Homework1. Register for Sapling

2. Register your clicker device (either clicker or smartphone)

3. Take Quiz 1 (in Blackboard – due Fri 11:59 pm)

4. Learn SI prefixes

5. Learn nomenclature (elements, ions, …)

Announcements• If missed Monday – please see me after

class

• If you missed lab on Wed.– You will be doing Lab A next week– You will also be preparing for Lab C

• Making stock solution of caffeine (do prelab question)– Lab B will be done at home

• Chem Club Today

Chapter 13

Properties of Solutions

• Solubility – Amount of solute that can be dissolved into a standard amount of solvent (at given temp).

Dissolution of an NaCl crystal in water. Polar water molecules surround ions pulling them from the crystal surface into solution.

NaCl dissolving movie

Dissolution (or solvation) – process of putting solute into solution

Crystallization – process of solute coming out of solution

Saturated solution – solution where no more solute can be put into solution. (dissolution and crystallization are happening at same rate)

Unsaturated solution – solution that can have more solute dissolved into it before it becomes saturated.

Supersaturated solution – Unstable solution with an excess of solute dissolved.

I have a beaker with water and I add a lot of sugar to it. A week later, the beaker still has sugar in the bottom of the beaker. I have a _______ solution.

a) unsaturated solutionb) saturated solutionc) supersaturated solution

If I have a saturated sugar solution with sugar at the bottom of the beaker, are the sugar crystals still dissolving?

a) yesb) no

• http://www.youtube.com/watch?v=0wifFbGDv4I• http://www.youtube.com/watch?v=nvHrXr5Jajg

The Solution ProcessGeneral rule of thumb for predicting solubility:

“Like dissolves like”

Solubility of…

Ionic Salts Gases

Effect of Pressure on Solubility of Gases

g gS kPHenry’s Law