CHEM 1412 lab report, Freezing point.docx

CHEM 1412 lab report, Freezing point.docx - Gannyva...

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Gannyva Capitanachi Molar Mass Determination by Freezing Point Depression in t-Butyl Alcohol Calorimetry CHEM 1413 P15 South Texas College Summer 1 2018 Dr. Subrata Mandal Gannyva Capitanachi
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Gannyva Capitanachi Molar Mass Determination by Freezing Point Depression in t-Butyl Alcohol Objective: The student will observe and determine the freezing point of t-butyl alcohol; will figure out the molal freezing point constant for t-butyl alcohol, as well as determining the molar mass of an unknown. Materials Used: Beaker Thermometer Test tube Stirrer Ice Stop watch T-butyl alcohol Gloves Goggles Apron/lab coat Pipet Spatula Substance unknown Balance Graduated cylinder Summary of Procedures: I. Determining the Freezing Temperature of t-Butyl Alcohol 1. Place a large test tube (250 mL) inside a beaker to the nearest 0.1 g. Record mass. Measure 25 mL (+,-) 1 mL of t-butyl alcohol in the graduated cylinder. Once that’s done, transfer the alcohol to the test tube. Measure and record the mass of all three (test tube, alcohol, beaker). 2. Look at figure 3 and place your materials that way. Make sure the thermometer end bulb is at the middle (vertically) of the t-butyl alcohol and in a way that the thermometer does
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Gannyva Capitanachi Molar Mass Determination by Freezing Point Depression in t-Butyl Alcohol not touch the sides of the test tube. Adjust the stirrer so that it can be moved from the bottom of the test tube to almost the top of the liquid. 1. Fill a 600 mL beaker with cold water two-thirds full. If the temperature of the tap water is greater than 20 C, add small pieces of ice to the water to cool it below 20 C. Measure and record the temperature.
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