Results: The Results matched my hypothesis. I predicted that the added energy for the heated water would make the tablet disintegrate quicker. This prediction seemed to show. The hot test was set up. It took about ten minutes for the hot plate to warm up to the needed 50 degrees Celsius. During this time. The beaker had oxygen bubbles starting to appear at about 40 degrees Celsius. When finished, we were not given the tongs in time, and the temperature rose to 56 degrees Celsius. We took the beaker off the hot plate, and then recieved the tongs. Waiting for the temperature to decrease, we noticed that the temperature showed by the probe seemed to increase and decrease, sort of like a mountain with little hills on it. When the temperature was matched, the tablet was dropped into the beaker.
Diagram of the Hot Test (first 150 secs)
The tablet fell into the water, and almost immediately dissolved. It made an extremely rapid fizzing noise and shrank in size relatively quick.
Time for disentergration: 22.4 secs
Temperature of Tablet's Drop: 48.9 Celsius (-1.1 C)
The room temperature water was relatively simple to set up. Get water, put in probe, drop tabley. We predicted this would take a slightly sloer time since there wasn't as much energy as the hot water. After measuring the water and entering the probe, we waited until it hit a relatively even 25.5 degrees Celsius. The tablet was dropped in and there was a familiar fizzing noise. This time, the tablet did take longer, but not by much difference.
Diagram of Room Temperature (Reaction)
Time for Disentergration: 36 secs
Temperature for Tablet's Drop: 24.9 Celsius (-0.6 C)
Cold Test
Now, the cold test was to half the water, but include ice cubes. We added quite a few ice cubes to the water and started to stir for 60 seconds. The ice didn't seem to melt through this process and it made the water extremely cold. After stirring, we measured the temperature: exactly 1 degree Celsius. That's very cold. So, the tablet was dropped into the beaker, and a slow reaction started to occur. The reaction was easily the slowest, slowing at one fourth of the pace the room temperature test went. The bubbles released did not seem to evaporate, but stay underneath the ice still present and the surface.
Diagram of Cold Water Test. Through entire procedure.
Time for disentergration: 2 minutes, 8 seconds
Temperature of Tablet's Drop: 1.6 Celsius (+.6 C)
Conclusion: The results for this lab were fairly predictable. The intention to find the quickest way to dissolve was to use warm water. I remember that warmth induces energy. Just how gases have their atoms more free flowing than both liquid and solid. This is because the gas in states of matter is needed to be warmer to get that extra energy. Now, the oxygen in the tablets are in luttle air pocket bubbles. Bubbles are a common sight in water nearing or at boiling temperature. The reason for this is that the oxygen is seperated from the hydrogen, and leaves the liquid. Also known as evaporation, it is not common to find in colder water. In the warmer test, the bubbles that were released from the Alka-Selzer tablet immediately reached the surface, due to their mass, popped and disappeared. Now, when it came to the other tests, there was little or no evaporation that ocurred. The room temperature had a little of the bubbles evaporate, while the cold water had all the bubbles stick together on the surface of the water, or underneath the ice cubes, trying to squeeze their way through. The oxygen needed to escape, and the heat will seperate the oxygen and hydrogen. Therefore, it dissovles faster, and it shows in the experiment.
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