Chemical Reactions Temperature Investigations

For this experiment, chemical reactions, we investigated how chemical reactions change with temperature. We took hot, room temperature, and cold water and dropped an alka seltzer pill into each. My hypothesis for the experiment was that the warmer the water got the faster the the pill would dissolve. We the waters one at a time, room temperature first. The pill dissolved for about 30 seconds and the temperature changed from 23.1 degrees C to 22.7 degrees C. Next we did hot water. It took about 3 minutes to warm up on the hot plate up to 50 degrees C. Once we got it to that, we dropped another alka seltzer pill into the beaker it only took about 22 seconds for it to dissolve and the temperature went from 50 degrees C to 48 degrees C. Finally we used water that was filled with ice. After a minute of stirring we started at .6 degrees C. When we dropped the pill in after about 2 minutes the temperature went from .6 degrees C to .3 degrees C. In the end my hypothesis was correct, as the temperature of the starting water increased, the time of which the alka seltzer pill dissolved was decreased. Also with each test the end result was cooler than the start.