Hand in when entering the lab. No admittance without a completed PreLab.

1. What is the purpose for this experiment? _________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________
2. What is meant by the term "Hard Water"? _________________________________________________________
3. What is the goal of water softening? _____________________________________________________________
4. What is the main ingredient in Calgon?___________________________________________________________
5. What other ingredient does Calgon contain that helps soften water? ____________________________________
6. How does an ion-exchange resin soften water?_____________________________________________________ __________________________________________________________________________________________
7. How does Sodium carbonate soften water? _______________________________________________________
8. What is the control in this experiment? ___________________________________________________________
9. What should you do if your Calgon water sample is cloudy? __________________________________________
10. What is turbidity? ____________________________________________________________________________
11. In the soap test, more suds means what? _________________________________________________________
12. When adding Sodium carbonate to a sample, a cloudy precipitate means what?___________________________ __________________________________________________________________________________________
13. In step 8 why should each filtrate sample be the same volume? _______________________________________
14. In step 10, why wipe the stirring rod? ____________________________________________________________
15. In step 4 what would happen if you filled the funnel above the filter paper? _______________________________ __________________________________________________________________________________________

Questioins? Comments??
Ted Richardson, Toledo Technology Academy