Nina G.
Nicolette G.
Dr. Forman
Chemistry
Abstract: The purpose of this lab was to check succinic acids solubility at different temperatures and to understand how the solubility curve works. In this lab we checked the crystal height at three different temperatures: 45°C, 55°C, and 65°C. Overall we realized that the higher the temperature, the higher the solubility of the succinic acid and the crystal height.
Procedure:
45 degrees
1. Turn on hot plate
2. fill beaker with 300 ml of water
3. Put beaker filled with water on beaker and wait for it to heat to 45°C and stir the water occasionally
4. Got 4 to 5 grams of succinic acid
5. Prepared an ice bath with water and ice cubes
6. Once we got it to 45°C, we used our tongs to remove the beaker from the hot plate
7. We poured all the succinic acid in a test tube using a funnel
8. Put 20 ml of distilled water in a graduated cycliner
9. Put the 20 ml of water into the test tube with the distilled water, however since the test tube was to small we couldn't pour all the whole 20 ml of water into the test tube
10. We put the test tube with the water and succinic acid into the 45 degree water and stirred with a glass rod every other 30 seconds for 7 minutes, and constantly checking to make the sure the temperature was still at 45 degrees
11. We put the beaker with the test tube back on the hot plate because the temperature was down
12. Took it back off once it reach around 45°C
13. After the 7 minutes was over, we took the test tube and poured out the water into another test tube avoiding pouring out the succinic acid, and then put it into a ice bath for 2 minutes
14. We dilluted the test tube with the succinic acid and cleaned it out
15. We then took the test tube out of the ice bath after 2 minutes let it sit at room temperature for 5 minutes
17. Lastly we recorded our results
55 degrees
1. Same steps except you heated the beaker with 300 ml of water to 55°C and we used and bigger test tube so all the water and succinic acid could fit.
65 degrees
1. Same steps except you heated the beaker with 300 ml of water to 65°C. Also you didn't need to seperate the water and the succinic acid after you stirred the test tube every 30 seconds for 7 minutes in the heated beaker because the succinic acid was dissolved completely in the water.
Result:
Lithium
Mean: 61.6
Histogram
This aggregated data shows the different groups height of the crystal at 45°C, 55°C, and 65°C. There is some difference in the data because people temperature could have been different by a tenth or by 1 or 2 degrees. Also another reason could be the fact that we could collect 4 to 5 grams of succinic acid so some may have had 4.20 grams of succinic acid and others may have had 4. 90 grams, which could have affected differed there results from the other groups.
Pg. 59:
Data Analysis
1. 45°C: 14.1, 55°C: 101.3, 65°C: 102.8
2. Yellow: Class mean, Pink: Lithium mean
Questions
1. We didn't do two test tubes for each temperature but it would be helpful so we could check our work.
2. Since succinic acid was a solid, we knew that when the temperature was risen the solubility should have risen as well.
3. Yes all the succinic accid that originally dissolved in the water crystallized out of the sollution because since we cooled it and allowed it to sit at room temperature the dissolved substances re-formed as crystal as shown in the finals photos under each degrees steps.
4. Yes we did have enough data since all the lab groups had results for each temperature. The curve would be good enough to make useful prediciton abouth other temperatures because with these results we know that the higher the temperature the more soluble the substance is.
5. Procedures that could lead to errors are dirty tools, the temperatures since there could been many temperatures around 45°C that could have caused there results to be different from the other groups. Also the step where you got succinic acid because you could had to get between 4 to 5 grams so everyones amount differed.
6. A different procedure for gathering data to construct a solubility curve would be taking a gas, putting it in water and writing the results for the solubility of the gas at different pressures.
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