Ice+Ice+Baby

ICE ICE BABY. Caroline Blanchard and Kinnery Patel. The purpose of this lab was to compare different endothermic reactions of different concentrations and different chemicals to determine to most endothermic reaction. In this lab, endothermic reactions were produced by mixing three different chemicals with water. The three chemicals used were ammonium chloride, potassium chloride and ammonium nitrate. Four different molar concentrations were used for each chemical ranging from .01 mol to .2 mol of chemical mixed with 100 mL of distilled water. Each of the chemicals used were soluble in water. After the experiment concluded, the greatest change in temperature was produced by the reaction between ammonium nitrate and water, at the greatest concentration that was tested. Each reaction took place in a calorimeter to ensure the most accurate results of the changing temperatures. After determining the chemical that produces the most endothermic reaction, a chemical cold pack can be made with that chemical to produce the most effective cold pack possible.

Key terms: Endothermic reaction, soluble, concentration, calorimeter. media type="file" key="Ice Ice Baby!.wav"

Figure 1: The calorimeter, magnetic stir bar and temperature prob used to accurately track the changes in temperature during each reaction

Figure 2: The temperature change of an endothermic reaction when .01 mol of ammonium chloride was added to 100 mL of water

Figure 3: The temperature change of an endothermic reaction when .2 mol of ammonium nitrate was added to 100 mL of water

Table 1: The average temperature changes of all of the endothermic reactions

Links:

MANUALLY ACTIVATED CHEMICAL COLD PACK http://www.google.com/patents?id=33SgAAAAEBAJ&pg=PA3&dq=chemical+cold+pack&source=gbs_selected_pages&cad=2#v=onepage&q&f=false (Accessed 2011 February 15)

Verakas, J. (1973, May 24). CHEMICAL THERMAL PACK - Google Patent Search. Google. Retrieved March 6, 2011, from http://www.google.com/patents?id=YBI-AAAAEBAJ&printsec=description&zoom=4#v=onepage&q&f=false