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dwurst_example - E xperiment 1 Solid-Liquid Equilibria in a...

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Experiment 1, Solid-Liquid Equilibria in a Two-Component System Experiment 1, Solid-Liquid Equilibria in a Two- Component System Author: Daniel Wurst Group 1 Section 3, T 2:00 PM - 5:00 PM Partners: Jeannie Flick & Christopher Powell 9/21/2010 Abstract: In this experiment, the phases of a binary system were documented at different conditions. This was done in order to make a solid-liquid phase diagram. The testing was done on triphenylmethane (TPM) and stilbene with a heat flux differential scanning calorimetry (DSC). The concentration, mass, and rate of temperature change were all controlled throughout the experiment, while the temperature was allowed to vary during the testing. Computer analysis was used to measure the enthalpy of fusion along with peaks in the Wurst Page 1 9/21/10
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Experiment 1, Solid-Liquid Equilibria in a Two-Component System temperature as it ranged during the tests. In the end the solid-liquid phase diagram for the binary system was constructed using the data found. Wurst Page 2 9/21/10
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Introduction: The purpose of this laboratory experiment was to explore the use of thermal analysis, specifically differential thermal calorimetry, and use it to construct a solid-liquid phase diagram for a binary system. In this experiment, the lab group was called upon to test various concentrations of stilbene and TPM in order to construct the two-phase diagram for the two components. This was done by using a Mettler Toledo Differential Scanning Calorimetry to test for the heat of fusion and to see when phase changes took place. Several runs were made of which the data was collected and compared via a computer analysis and compiled into the desired diagrams. The H fus was calculated from each compound melting and analyzed to literary values. By using the following equation, the change in Enthalpy due to the substances melting can be calculated: = ∆Sfus ∆HfusTf Also, a phase diagram of the temperature to mole fraction was made and analyzed. Similarly, an Enthalpy phase diagram was created based off of the data taken along with an Enthalpy diagram calculated from theoretical values. The theoretical diagram was made using literature values and the following equations: = , , - Rln XA ∆Hfus A1Tf A∙ 1T (1-12) = , , - Rln XB ∆Hfus B1Tf B∙ 1T (1-13) The diagrams made allow for the data to be compared to the theoretical values as well as literary values. Similarly, the diagrams are analyzed to see if they resemble the structure of
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Experiment 1, Solid-Liquid Equilibria in a Two-Component System the diagram provide as a sample Liquid-Solid Phase diagram on page 1.3 of the experimental handout. Experimental: No derivations were made from the lab hand-out’s experimental procedure; therefore, it was carried out as listed. BEFORE BEGINNING THE EXPERIMENT 1. Turn on the DSC (if the green light on the instrument is lit, it is already on). The power switch is located on the back of the instrument.
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