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Unformatted text preview: Experiment 12 Colligative Properties Fall 2008 Name Nicholas Givens Lab Day and Time 1:00PM Tuesday TA Leila Flagg Section 408 Documentation Experiment 12 Lab Manual, No Partner GRADING RUBRIC Possible Points Points Received Introduction 10 Purpose of report Goals of the experiment Materials and Methods 20 Describe procedure in paragraph format following guidelines provided (-2 for each type of mistake) Results and Discussion 40 Inserted titles for tables Inserted graphs into template Inserted captions for each graph Showed complete sample calculations Summarized all data in tables Answered questions completely Error analysis Unknown Identification 10 Laboratory Technique 20 TOTAL (100) TA Comments/Suggestions: C HEMISTRY 102L R EPORT T EMPLATE EXPT. Colligative Properties 12 12 Introduction The purpose of this report is to observe effects of changing a solutions colligative properties. The objective of the experiment was to use colligative properties to determine the molar mass of a substance. Materials and Methods An ice/salt/water bath was prepared by first placing about 35 g of solid NaCl in a 40-mL beaker and adding just enough water to dissolve the salt. A 600-mL beaker was then filled about 2/3 full with ice. The salt-water solution was added to the beaker of ice and the whole mixture was stirred with a stirring rod. The prepared bath was placed on a stir plate. A temperature sensor, the tip of which was covered lightly with vacuum grease, was gently inserted into a one-hole rubber stopper obtained from the TA bench. 25 mL of cyclohexane was carefully measured out into a clean, dry, 125-mL Erlenmeyer flask from a buret under the hood. The exact measured out into a clean, dry, 125-mL Erlenmeyer flask from a buret under the hood....
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- Fall '08