This experiment was to collect data to make a solubility curve (for succinic acid). In the investigation our objective was to first prepare a warm-water bath by heating the beaker (with stirring) to 45, 55, and 65 degrees celsius (three trials so these steps were all repeated three times). Then succinic acid was placed into a test tube. After, we placed the acid tube in the bath; stirring the succinic acid solution. After, we emptied the test tube and pour the left over hot water into the sink. Then our ice bath was prepared (to do this we added many ice cubes to about 400 mL, the height we were aiming the water to be at). Next, we placed the test tube into the clear liquid from the ice bath. It rested there for about two minutes. Then our liquid was stirred in the test tube. After, the liquid was then removed from the ice water bath. Our test tube was now allowed to change from icy cold to room temperature. Then we swirled the liquid. After swirling, we measured the crystal height. After measuring, we rinsed the succinic acid crystals from the test tube. We repeated all of these steps three times.My group did three trials repeating all the steps (from the procedure below) receiving many different results. Our results are as follows: in the first trial there were white particles, spread about the test tube. In the second trial there was 3/4 of white crystals filled out the test tube (except the top of the test tube). Then in the hot bath (for the third trial) the solute completely dissolved and there was almost white everywhere. We ended up getting 7.17 as our average.
Procedure:
In this investigation, my group and I collected experimental data to construct a solubility curve for succinic acid. Step number one, we were to prepare a warm-water bath, heating the beaker (with stirring) either to 45, 55, 65 degrees celsius. Step number two, my group placed succinic acid in the test tube. Step number three, we placed the acid tube in the bath; stirring the succinic acid solution. Step number four, we emptied the test tube. Step number five, we poured the hot water from the beaker into the sink. Step number six, we prepared an ice bath. Step number seven, we placed the test tube in the clear liquid in the ice bath for two minutes; stirred the liquid in the test tube then removed it from the ice water, allowing it to change to room temperature. Step number eight, we swirled the liquid. Step number nine we measured the crystal height. And finally step number ten, we rinsed the succinic acid crystals from the test tube. We repeated these steps three times (in three trials) receiving many different results which are as follows.
Results:
Trial 1:
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| Round 1: heating the beaker (with stirring) to 45, 55, 65 degrees celsius. |
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| Round 1: We just had poured the succinic acid into the test tube |
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Round 1: Measurements in the ice bath
Results for Trial 1:
There were tiny white particles that floated throughout the test tube with white solute was at the bottom. There was Less crystals in the middle, but more crystals at the top.
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Trial 2:
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| Round 2: Heating bath
Results for Trial Two:
There were white crystals that filled up about 3/4 of the test tube (all but top doesn't). Then it turned yellow (we thought), but it was only part of the tube.
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Trial 3:
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| Add caption |
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| Round 3: Hot bath |
In the hot bath the solute completely dissolved! Then it all was white (almost).
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| My group's solubility graph |
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| My classes results |
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| My groups' results
Data Analysis:
1. Mean:
-7.17
2. Graph
- See graph above
Questions:
1. Why is it useful to collect data from more than one trial at a particular temperature?
- It is useful to collect data from more than one trial at a particular temperature because then the results from each can be compared. Like in our lab we had different results for each temperature: at 65 degrees celsius the hot bath caused our solute to completely dissolve. At the end almost all of the test tube was covered in succinic acid. At 55 degrees celsius, there were white crystals that filled up about 3/4 of the test tube (all but top doesn't). And finally in 45 degrees celsius, there were tiny white particles that floated throughout the test tube with white solute was at the bottom and there was also less crystals in the middle, but more crystals at the top.
2. How did you make use of the properties of a saturated solution at different temperatures?
- The particles were floating and spread about everywhere in the tube for each of the temperatures so that shows a physical description/property of the saturated solution. Another property would be that the crystals dissolved in the second trial (while being heated on the hot plate/in the water bath) and some floated to the bottom in trial 1 (with all being mixed everywhere in trial 3, so you could say some were at the bottom!).
3. Did all the succinic acid that originally dissolved in the water crystallize out of the solution? Provide evidence to support your answer.
- Yes all the succinic acid that originally dissolved in the water crystallized out of the solution in one of the three trials. In trial two, during the hot bath/heating to 55 degrees celsius, the solute completely dissolved, so the succinic acid that originally dissolved in the water crystallized out of the solution.
4. Given pooled class data, did you have enough data points to make a reliable solubility curve for succinic acid? Would the curve be good enough to make useful predictions about succinic acid solubility at temperatures you have not yet investigated? Explain your answers.
- I did have enough data points to make a reliable solution for succinic acid and the curve was good enough to make useful predictions about succinic acid solubility at temperatures not previously investigated. This is because the temperatures caused a rise in the millimeters so one who has not previously investigated this would have a good prediction that in different temperatures, they weighed more in millimeters.
5. What procedures in this investigation could lead to errors? How would each error effect your data?
- The hot water bath could be a procedure that would lead to an error. In my group, for instance, we shared a hot plate with another group. In an accident, the two hot baths could have been switched and all of the data (for both groups) could have been wrong!
6. Using your knowledge of solubility, propose a different procedure for gathering data to construct a solubility curve.
- To gather the data to construct a solubility curve, a different procedure could be to heat three baths at different temperatures and put in the test tubes filled with succinic acid, so it could speed up the process!
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