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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 solution’s 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
- Erlenmeyer flask, Freezing-point depression, cyclohexane, Temperature Vs