Freezing point lab report.pdf - Laboratory Molecular Mass Determination by Freezing Point Depression in t-Butyl Alcohol Chemistry 1412PF.1 General

Freezing point lab report.pdf - Laboratory Molecular Mass...

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Laboratory # Molecular Mass Determination by Freezing Point Depression in t-Butyl Alcohol Chemistry 1412PF.1- General Chemistry II South Texas College Spring 2020 Dr. Reginald Christopher Gonzales Jessica Martinez Partner: Nora Lopez
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I. Title A. Molecular Mass Determination by Freezing Point Depression in t-Butyl Alcohol II. Introduction/Purpose A. The objective behind this experiment is to determine the molecular mass of the unknown solvent by using colligative properties of freezing point depression. By studying the changes of the unknown when it is added, data can be obtained to identify this substance. III. Materials A. 600 mL beaker B. Distilled water C. Rubber stopper D. Graduated cylinder E. Goggles F. Thermometer G. Test tube H. Electric balance I. 150 mL beaker J. Stand and ring clamp K. T-butyl alcohol L. Ice (if needed) M. Wire stirrer IV. Procedures A. Determination of the freezing point of t-butyl alcohol 1. Step one for this experiment is to gather all of the materials needed.
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2. Second step is to fill a beaker with crushed ice and cold water to the top 3. After, put 25 mL of t-butyl alcohol in the test tube using a graduated cylinder and then re-weigh and record. 4. Then, place the test tube in the ice water; immediately check temperature, record and stir every 30 seconds until a minimum of 300s is reached or until the alcohol is frozen. 5. Repeat experiment again. A. Determination of the freezing point of solution of t-butyl alcohol and water 6. Step one for this experiment is to gather all of the materials needed. 7. Second step is to fill a beaker with crushed ice and cold water to the top 8. After, put 25 mL of t-butyl alcohol with 2 mm of distilled water in the test tube using a graduated cylinder and then re-weigh and record. 9. Then, place the test tube in the ice water; immediately check temperature, record and stir every 30 seconds until a minimum of 300s is reached or until the alcohol is frozen. 10. Repeat experiment again. A. Determination of the freezing point of unknown solution and t-butyl alcohol 11. Step one for this experiment is to gather all of the materials needed. 12. Second step is to fill a beaker with crushed ice and cold water to the top 13. After, put 25 mL of t-butyl alcohol with 2 g of unknown substance in the test tube using a graduated cylinder and then re-weigh and record. 14. Then, place the test tube in the ice water; immediately check temperature, record and stir every 30 seconds until a minimum of 300s is reached or until the alcohol is frozen. 15. Repeat experiment again. V. Pre-Lab questions
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