lab2 - Yichen(Emily Li Section 105 Mixed Melting Points In...

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Yichen (Emily) Li Section 105 7/1/11 Mixed Melting Points In this experiment, I created a mixed melting point by filling capillaries with both my and Shelly’s sample. We crushed our sample to make sure that the compounds mix well and it is homogeneous. Then I took the capillary filled with our sample and put it into the apparatus. The mixed melting point range was 118˚C – 119.7˚C and this was within +/- 4˚C of both our individual melting point ranges (Emily: 119.1˚C – 119.7˚C; Shelly: 118.4˚C – 119.7˚C). This meant that our samples were identical. Table 1: Average Values of Final Temperature of Given Melting Point Ranges Ratio of A:B (weight) Average Values of Final Temperature of Given Melting Point Ranges (˚C) 100:0 99.5 90:10 92.3 80:20 87.4 70:30 62.3 60:40 65.5 50:50 65.4 40:60 63.2 30:70 60.6 20:80 66.2 10:90 63.0 0:100 69.5 For the ratio of 80:20, I left out Student 3’s range of 60.8˚C -62.4˚C because it is much lower than the other two students’ ranges (86.2˚C -87.5˚C and 85.5˚C -87.2˚C). For the ratio of 70:30, I left out Student 2’s range of 60.3˚C -86.0˚C because the final temperature is much higher than the other two students’ ranges (58.6˚C -62.5˚C and
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