lab 3 in lab

lab 3 in lab - Data Tables Note All masses must be reported...

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Data Tables Note: All masses must be reported to three decimal places and all temperatures must be reported to one decimal place. Data Table A. Measuring the Freezing Point of Stearic Acid Mass of 30 mL beaker 20.866 g Mass of 30 mL beaker plus stearic acid 29.802 g Mass of stearic acid 8.936 g Measured freezing point of stearic acid (first trial) 68.7 °C Measured freezing point of stearic acid (second trial) 68.1 °C Average measured freezing point of stearic acid 68.4 °C Data Table B. Freezing Point Depression by a Solute, Lauric Acid First Solution Second Solution Mass of 30 mL beaker (from Part A) --- --- Mass of 30 mL beaker and contents 29.802 g 29.802 g Mass of 30 mL beaker plus stearic and lauric acids 30.805 g 30.805 g Total mass of lauric acid 1.003 g 2.005 g Colligative molality (m c ) of the solution (Your stearic acid mass from Table A is not accurate Please use your original beaker tare and the necessary data from Table B) .5609 m 1.262 m Predicted T f (Assume that k f is known to two sig figs, 4.5 °C/m) 2.5 °C 5.7 °C
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This note was uploaded on 03/18/2011 for the course CHEM 202 taught by Professor Feducia during the Spring '09 term at N.C. State.

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lab 3 in lab - Data Tables Note All masses must be reported...

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