Experiment 1 LAB

Experiment 1 LAB - Experiment 1: Density and Melting Points...

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1 Experiment 1: Density and Melting Points Mohrig, 3 rd edition Chapter 14 Theory: These topics have been covered in general chemistry, however, in Chem 6A we use these measurements to identify organic compounds and, in some cases, approxi- mate purity. A. Density (sample identification) Density can be measured in g/mL or mg/mL. We will use the units g/mL for our experi- ment. Density is a very useful property for identification purposes and can be measured of gases, liquids and solids. The density of a liquid is determined by finding the weight of a specific volume of a liquid. To do this, you will use 1-mL plastic disposable syringes [no needle] to precisely measure 1 mL. The technique involves: 1) weighing the empty syringe 2) filling the syringe to 1 mL with each of the organic liquids (toluene, cyclopenta- none and ethyleneglycol) supplied in the laboratory, and then 3) weighing the liquid plus the syringe. The difference is the weight of 1 mL of the liquid: the density. Measure the density for all three organic liquids. Make a data table to record your measurements. B. Melting point (sample purity and composition) This experiment is designed to introduce students to the use of a typical “melting-point apparatus,” which you will use repeatedly throughout Chem 6A-B . We will demonstrate that pure compounds have “sharp”
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This note was uploaded on 08/14/2010 for the course BIO 2010 taught by Professor Le during the Summer '10 term at UCSB.

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