Lab Report 16

Lab Report 16 - Freezing Point Depression (Lab #16) Jesse...

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Freezing Point Depression (Lab #16) Jesse LaSalle TA: Guang Li Experiment Completed: February 5, 2008 Report Submitted: February 12, 2008
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I) Purpose : To utilize observations made of freezing point depression in order to determine the molecular weight of an unknown compound. II) Procedure : Casey, J. and R. Tatz (2008). Freezing Point Depression. General Chemistry Laboratory Experiments , Hayden McNeil. Vol.2: 54-55. III) Data : (See attached report form.) IV) Calculations : Mass of solvent (kg): = × Mass V d1000g = . × . Mass 19 9mL 0 779gmL1000g = . Mass 0 0155Kg Freezing Point depression, Trial 1 = - ∆TF Freezing point of solvent Freezing point of Solution ∆TF = . ° - . ° = . ° 7 7 C 5 1 C 2 6 C Molality of solution, Trial 1: = m ∆TFKf = . . / m 2 6℃20 00℃ m = . m 0 13m Moles of sample in solution, Trial 1 = × mol solute m solventkg = . × . mol 0 13m 0 0155021Kg = . ≈ . - mol solute 0 002015273mol 2 02x10 3 mol Molecular weight of sample, Trial 1 = MW g solutemol solute
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This lab report was uploaded on 02/25/2008 for the course CHEM 122 taught by Professor Zellmer during the Winter '07 term at Ohio State.

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Lab Report 16 - Freezing Point Depression (Lab #16) Jesse...

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