Cold Pack Chemistry

Overview

Objectives/Goals My objectives and goals were to see a temperature difference in 200mL cup of water. I would use different amounts of ammonium nitrate, a crystal that has a chemical reaction with the water. The amounts were 10g, 20g, 30g, 40g, and 50g. My goal was to see if 50g would have the biggest temperature change when added to water. I was bascially trying to see which amounts of ammonium nitrate make the water temperature change the most. Methods/Materials The most important materials I used were ammonium nitrate, a crystal in coldpacks. I also used water to cause the chemical reaction, a scale to measure the ammonium nitrate ammounts, and the most imprtant, a thermometer to measure the temperatures as the chemical reaction is caused. This would all happen in a cup with 200ml of water, 1 for each amount of ammonium nitrate. Then taking the beginning temperature, 15-20 seconds later the middle termperature and so on til the temperature did not change. Lastly, subtracting the beginning temperature to the ending termperature, finding the temperature difference for each cup. Results I had 5 diferent results for the 5 different amounts of ammonium nitrate. All of them coming from subtracting the beginning temperature to the ending temperature. For cup #1, 4 degress in difference. Cup #2, 10 degrees in change. Then 14 degrees in change for cup #3. Lastly my biggest change in temperature, cup #4 and cup #5, 20 degrees and 25 degrees. Cup #5 proving my hypothesis that cup #5, 50g of ammonium nitrate would have the biggest change in temperature with 25 degrees. Conclusions/Discussion Using a digital thermometer was more successful than using a laser thermometer which made my temperatures innacurate at first. Though not with the digital thermometer which made my temperatures more accurate. I also concluded that I might have used ammonium nitrate crystals that had already started to dissolve since they looked pretty wet. Which did not let me have as big temperature differences. Though over all the bigest temperature difference was found when I used 50g of ammonium nitrate, a bigger amount than what they use in coldpacks.

Competition history

• CSEF 2017 Chemistry · Entry J0607

Resources

• CSEF project summary ↗

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