6A_Lecture_2 - Lecture 2 Experiment 1 Refractive Index...

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Lecture 2
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Experiment 1 Refractive Index Infrared Spectroscopy Mohrig Text 13.7-13.16 in Bruice, 6 th Ed
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Properties of solutions that depend upon the number of particles, not the mass. Freezing (Melting) point depression Freezing Point total = Freezing Point solvent Δ T f Boiling point elevation Boiling Point total = Boiling Point solvent + Δ T b
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Density (mass/volume) reported in g/mL Weigh 1.0 mL of known liquid and compare to the literature value (CRC…copy on GauchoSpace) Report % error [(Literature Value-Experimental)/Literature]x100 This value enables chemists to quantitatively compare methods and devices Melting Point Depression Experiment Taking melting points of different ratios of two solids.
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Mel-Temp®
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Temp of Mel-Temp should increase slowly ~ 5 °C per minute Pure compounds melt over sharp range
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What happens to the melting point of a pure compound as impurity is added?
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