Cold Water Test: In actuality, we did the Hot Water Test first, but to keep with a dramatic theme with keeping our test at the very last, I'm choosing to present the information with the last test we executed being written first. We filled the beaker to 133 mL (that was on our second fill because I had to trash our first try 'cause I accidentally filled it to 166 mL the first time 'round) then Mrs. Leland added a couple handfuls of ice cubes to the beaker. The instructions had said to add 2-3 ice cubes; I don't know what planet these people come from where 2-3 ice cubes brings the volume to 266 (perhaps Plant Giant Ice Cubes?), but our beaker was filled to about 266 mL using more ice cubes. We stirred for 60 seconds to "even out the temperature" then placed the thermometer in. The temperature dropped instantly and was at 1.9˚ celsius by the time we dropped the alka-seltzer in. That alka-seltzer took its sweet time dissolving and only finished after one minute, 58.9 seconds had past. And interesting note: the alka-seltzer plunked to the bottom and stayed there until it had dissolved to this tiny circle and floated up as close to the surface as it could (the ice sorta blocked it from actually reaching the surface). It just happened that I had taken a cursory glance at the temperature (or was it Amber who noticed?) and saw that the temperature had dropped to .3˚ degrees celsius by the end of the alka-seltzer.
Untitled from Amber M.S on Vimeo.
(A video of the Cold Water Test)
Room Temperature: This test was a fairly uneventful test. We filled it to 266 mL of water then waited a minute to allow it to adjust to room temperature before putting in the thermometer. After that, we dropped in the alka-seltzer and watched it dissolved. The temperature was 23.8˚ celsius and dissolved in 36 seconds. An interesting note: the alka-seltzer sank to the bottom, but "danced" in a way that one side of the alka-seltzer would pop up while the other end would stay firmly attached to the bottom of the beaker.
Hot Water: We placed the hot plate to medium and put a beaker filled with 266 mL of water on it with a temperature probe stuck in the beaker. In three . . . two . . . one PLOP! In fell the alka-seltzer, up went some water droplets, FWOOSH went the water in the beaker. The moment that alka-seltzer hit the 50˚ celsius water, it began to fizz up immediately and cloud up the whole beaker. The fizz lasted 21.09 seconds before the alka-seltzer was no more. Interesting note: the alka-seltzer shot straight up to the top of the beaker and floated around there.
So were we right? Heck, yeah, we were! Hot water is da bomb diggity! (Not really, I never say that phrase) But we were right in the fact that hot water dissolved the alka-seltzer the quickest. We attributed this swiftness to the fact that heat is energy which we figured would speed up the ionization (I'm in acid and base, I feel so special that I know what's going on rather than just "look! It's fizz!" * Dramatic Game-Show Host Voice * Amber and Katie, you have won the grand prize! * Amber and Katie in Our Squeaky Girl Voices * What is it?!?! * Dramatic Game-Show Host Voice * A job well done! How's it feel? * Amber and Katie in our Squeaky Girl Voices * Good so long as we get to keep that special ice cube. (Note: Must listen to video to understand--I'm right, by the way: it's the alka-seltzer, not a special fizzy ice cube).
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