Question

No water was added, the only substances in the flask was the lauric acid and the unknown. we were finding the freezing point. heated the glass to 60c everything dissolved took it out of hot bath and recorded temp drop which stopped at 39.44c

Unknown # Identify the unknown: Data: nknen Mass of Lauric Acid 9427 kat Et 31.442 43,2 Freezing Point of Lauric Acid Mass of Unknown .922 Freezing Point of Mixture Results and Discussion: (SHOW WORK FOR CREDIT) 1. Attach graph of the freezing point data to this report. Label the cooling region, the freezing region, and any supercooling. 2. Show the calculation of molality of the solution. 3. Show the calculation of the number of moles of unknown present in the mixture. 4. Show the calculation for the molecular weight of the unknown. 5. How many significant figures should be used to express your final result of molecular weight? Which item of data limits the significant figures in this particular experiment? 6. Use your answers from questions 2-5 as well as your data table to fill in the following chart (make sure to include units): freezing point of pure lauric acid freezing point of mixture freezing point depression molality of solution number of moles of unknown in solution molecular weight of unknown 7. If each molecule of unknown had dissociated into two ions in the lauric acid solution, what effect would there have been on the freezing point depression of the solution? Explain.

Answer 1

39.4406 Exeezing point Mirtuke AT kg lmpl +3 9 390 44 43. 2 362 +3.9 x 17 TmY 0.464 mat meles Oaurie aaid en 0942 unhngon 2 KY

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