March 25th/26th

Today in class...

After the intro to lab 15 last class, we investigated the filtration of a solution. We experimented with two solutions...Copper Sulfate and Water -AND - Salt water. The students measured mass of the solutes and solvents, and later combined the masses as they mixed and made the solution. The students then filtered the solution, trying to capture as much solute as they could. In the end, they measured the mass and volume of the liquid remaining in the test tube. This allowed them to calculate the density of the liquid in the tube. If it were 1g/mL, then that would lead us to believe it is water in the test tube and ALL traces of the solute have been caught. However, the students should look for evidence that supports -AND- rejects that thought.

5 Conclusion Questions for HW:
1. Is Copper Sulfate soluble in water? What's your evidence?
2. Is Salt soluble in water? What's your evidence?
3. Were you able to separate ALL of the copper sulfate from the water? EXPLAIN!
4. Were you able to separate ALL of the salt from the water? EXPLAIN!
5. Explain whether or not you are confident with your data? (Did you do all the measurements correctly? Are the numbers adding up right? Does something not make sense? It's okay to question yourself and the data you collected? If something doesn't seem right, can you pinpoint what may be the reason?)