Today, my table group - Hattie experimented with alka-seltzer tablets and room temperature water, hot water, and lastly, ice-cold water. I was trying to find out how long the alka-seltzer would take to fizzle and release all of its oxygen while it dissolves, and I thought that for all three tests the time would be nearly the same. Apparently, I was way off. During the room temperature test, the water was at a nice and toasty 23.5°C, and when the seltzer was put in, the temperature actually dropped .3°C. It took about 40 seconds for the reaction to stop, and there was some moisture on the beaker, as well as a little bit of fog.
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| In these images, it shows the temperature of the room temperature water test from a line graph to actual numbers on a chart. |
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In the hot water test, which was second, the tablet actually dissolved within 25 seconds, and the water was 50°C.
In the three above images are the temperatures of the water whe it is at it's hottest point and what temperature it is when the seltzer is dropped into the water, and it actually drops about 2 degrees.
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This video right below this shows the alka-seltzer dissolve in the cold water test, and the water actually got to about 1.7°C. The tablet took an immensely long time to dissolve, and in reality, it was exactly 1 minute 55 seconds. That truly amazed me and showed that temperature really does matter in how long alka-seltzer and other similar tablets take to dissolve and oxygenate water.
In conclusion, my hypothesis was really off and made me wonder, "How in the world did I think that water temperature doesn't matter". Well, I learned something new, and it can actually help people if they want to have a dissolved tablet in less than half a minute. The video above isn't the best quality, but if you look closely, you can actually see the large and some small bubbles from the tablet.
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