For the first test we heated the water on a hot plate, until it was 50 degrees celsius. Then I used the tongs to pick up the heated beaker of water, and put it on the stand. We then proceeded to drop a pelt of alka-selzer into the hot water. The alka-selzer reacted with the water causing it to fizzle as the pelt dissolved. The reaction went on for a short 21 seconds.
For this test we emptied the beaker of water and refiled it with room temperature water. This water was about 21 degrees celsius. Once the alka-selzer pelt was dropped into the water, it began to fizzle once more.
-Picture of our cold reaction. You can see the ice in the cup is partially obsucred by bubbles produced by the reaction.