MATERIALS:
- beaker(150 or 250 ml)
- copper(2) sulfate pentahydrate - caution, toxic substance scoopula
- 100ml graduated cylinder
- thermometer
- small square of aluminum foil
PROCEDURE:
1. We were handed a piece of paper with all of the instructions on it. Then we ( lab partner and I) went in to the lab and got all of our lab safety equipment and started on the lab.
2. We were told to go get all of the needed materials that we should have and go to our lab station. First we added 80 ml of water to our 150ml beaker. Then we measured the temp. 22 degrees Celsius.
3. Next, using our scoopula, we obtained some copper(2) sulfate pentahydrate. (the amount not important) placing into the beaker with the water; my partner stirred the two to together until the solid dissolved. It became a blue liquid. (the picture in the bottom) Temp. 23 degrees Celsius.
4. Then obtain the aluminum foil sample in front of you and crumple it into a loose ball. Put it into the copper (2) sulfate solution and stir for about 15 seconds. Nothing happened. Temp. 23 degrees Celsius.
5. Last we cleaned the scoopula and got a large scoop of sodium chloride and added it to the beaker. We stirred until all of the sodium chloride was dissolved and made detailed observations.
After everything was done, we made some very interesting observations about this lab. Like the temperature jump from a constant 23 degrees Celsius to 55 degrees Celsius!!! Also there was bubbling and the water has now become greenish. All indicators of a chemical change!
DISCUSSION:
We had a hypothesis that there would be a chemical change, but not like the one that it under went. My group was wondering, if we added more of everything, what would happen? So we did: what happened was a huge spike in temperature which in the end would reach 55 degrees Celsius.
CONCLUSION:
We were right in some ways and wrong in others. Our group made a hypothesis that there, in some point in the lab, would be a chemical reaction. We thought that there would just be color change. Our group was right, but there were more chemical reactions that we didn't think of, like the bubbles and heat change.
