1. Before the Bell Rings Grab 1 Paper from the side table
One person in each lab group log onto the computer at your station
Have your “Salt and Solubility” WS out to check.

2. ETD
Draw and Explain Both
1. Concentrated
2. Dilute

3. ETD47 ANS More qualitative terms
Concentrated - A relatively large amount of dissolved solute
Dilute – A relatively small amount of dissolved solute
Which is concentrated? Dilute? A B C D
Dilute Concentrated
Concentrated Dilute

4. Learning Targets
I can predict the conductivity of a solution based on its composition.

5. Supersaturated Demo
A solution that contains more dissolved solute than it should at a temperature (very unstable – will become saturated if there’s something to connect around) g pk
***SAVE UNTIL TEMP / SATURATION NEXT YEAR?***
3.5 g of Sodium Acetate * 3H2O per mL used.
e.g. 175 g / 50 ml
Or 105 g / 35 ml
Neil: 50g / 5 mL

6. Conductivity of Solutions
Conductivity increases with more ions (electrolytes) in solution.
Current can flow when the ions can move.
For acids, the H+ ion will dissociate
More for some acids than others
Think about ionic vs. covalent bonds
Will a covalently bonded molecule turn into ions when in solution?

7. Props of Solutions Conductivity Lab
Goggles!!!
Predictions 1st
DRAW/Explain All
Buckets A, B, C
Use LoggerPro
Buckets Stay Together AT BACK TABLES!
Your Group grabs a different beaker, tests it, replaces it.
Use DI WASH to Rinse + Dry Between Each Trial

8. On Lab Rank Conductivity Highest vs. Lowest

9. Learning Targets
I can predict the conductivity of a solution based on its composition.

10. Homework
1. Properties of Solutions: Electrolytes and Non-Electrolytes– Due next class. 2. Have a wonderful break, if you want to, you don’t have to.