Hypothesis: If we make the water colder, the alka seltzer will dissolve slower-- likewise, if we make the water hotter, it will dissolve faster. This is because the molecules in a hot object move faster than the molecules in a cold object.
Results:
As expected, the dissolving time went up as the water temperature went down. This graph will give a somewhat better idea of it.
It's also important to note that the alka seltzer tablets floated at the top when dissolving in the hot water, while they stayed on the bottom when dissolving in the room temperature and cold water. The alka seltzer tablets themselves had generally the same reaction-- excluding the time it took for the reaction to happen-- they fizzed and bubbled, and covered the entire glass with bubbles, as seen in the picture above.
Conclusion: Our hypothesis was supported. The seltzer tablet dissolved in 21 seconds in the hot water, 40 in the room temperature water, and 121 in the cold water. In this experiment, I learned that it's important to stay focused and be precise. If we had (accidentally) let the water heat up any longer, the alka seltzer would have dissolved faster than it was supposed to. Staying focused and being precise applies to any real life situation- school especially. However, since we did stay focused and we were precise, no problems or errors occured.
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