Chem208Lab1

# Chem208Lab1 - Results and Discussion Part I Determination...

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Results and Discussion: Part I: Determination of Heat Capacity of Calorimeter The first part of the experiment served to determine the heat capacity of our group’s calorimeter, using room temperature water and “hot” water. The “hot” sample of water was heated to approximately 5-6 degrees warmer than room temperature. Mass water = Mass of beaker with water – Mass of empty beaker Table 1: Calorimeter Heat Capacity Data and Results Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 T room temp ( ° C) 23.2 22.9 22.8 23.5 23.5 Mass Room Temp. Water (g) 47.711 46.805 39.821 50.958 50.444 T hot water ( ° C) 29.5 31.0 30.0 29.9 32.4 Mass “Hot” Water (g) 41.131 40.325 46.075 47.999 47.192 T final ( ° C) 25.4 26.0 25.8 25.6 27.0 T room temp water ( ° C) +2.2 +3.1 +3.0 +2.1 +3.5 T ”hot” water ( ° C) -4.1 -5.0 -4.2 -4.3 -5.4 C cal 120.98 J/ ° C 76.224 J/ ° C 103.179 J/ ° C 199.96 J/ ° C 93.49 J/ ° C Sample calculation: C cal T cal = - (m cold S cold T cold + m hot S hot T hot ) S cold = S hot = 4.184 J/g ° C T cal = T cold C cal T cal = [(47.711g x 2.2 ° C x 4.184 J/g ° C) +(41.131g x -4.1 ° C x 4.184 J/g ° C)] C cal = 120.98 J/ ° C Average C cal = 120.98 + 76.224 +103.179 +199.96 + 93.49 5 = 118.77 J/ ° C Part II: Determination of Heat of Solution for KCl

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In the second part of this experiment, the heat of solution ( H soln ) of potassium chloride (KCl) was determined by adding the salt to a sample of water, using the heat capacity of
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Chem208Lab1 - Results and Discussion Part I Determination...

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