Nick boyea billy lee 3/9/11 molar mass by freezing point depression overview the purpose of this lab is to measure the freezing point depression of a solution of an unknown substance and bht to determine the molar mass of the unknown substance. 3) calculate the molar mass of aspirin, in g/mol use the original mass of the aspirin from your data table, and the moles of aspirin you just found 4) compare this molar mass to the known molar mass. What is the first experimental step in calculating the molar mass by using the freezing point depression method you must first measure the freezing point of the pure solvent and then measure the freezing point of the solution. D) to learn a method to determine the molar mass of a solute in a solution by using freezing point depression d) which of the following would you expect to have a greater effect on the freezing point of the solution when dissolved in water.
Freezing point of lauric acid = 4387 c mass of unknown solute = 0507 g freezing point of solution (unknown in lauric acid) = 3935 c freezing point depression = 452 c show calculations too show more i want to find out the molar mass of an unknown solute using the given information. Camphor melts at 1798 degrees, and it has a particularly highe freezing point depression constant kf = 40 degrees/m when 0186g of an organic substance of an unknown molar mass is dissolved in 2201g of liquid camphor, the freezing point of the mixture is found to be 1767 degrees what is the molar mass of the solute. Molar mass by freezing point depression short answer experiment 1: measure the freezing point of pure water lab results 1 what was the mass of water used in this experiment 10000g data analysis 2.
From the freezing point depression of lauric acid we can determine the molar mass of benzoic acid equipment and supplies labpro interface, loggerpro software, two stainless steel temperature probes, hot plate, test tube containing. Purpose/introduction the purpose of this experiment is to determine the molecular weight of an unknown substance by measuring the freezing point depression of an aqueous solution of the unknown. 6356a molar mass by freezing point depression ap chemistry laboratory #4 introduction a procedure for determining the molar mass of a substance is very retrieval system, without permission in writing from flinn scientific, inc molar mass by freezing point depression page 8 post-lab questions (show all work on a.
I also did not know the answer to the final question molar mass by freezing point depression short answer measure the freezing point of pure water lab results. Santa monica college chemistry 12 determination of molar mass by freezing point depression page 1 of 1 name: date: lab section. Plugging the m c into equation 2, you can calculate the freezing point depression, δ t f, of the solution last, you must subtract this from the freezing point of the solvent to get the predicted freezing point of the solution.
Kf = 40 degrees/m when 0186g of an organic substance of an unknown molar mass is dissolved in 2201g of liquid camphor, the freezing point of the mixture is found to be 1767 degrees what is the molar mass of the show more camphor melts at 1798 degrees, and it has a particularly highe freezing point depression constant kf = 40 degrees/m. The change in freezing point is equal to the molal freezing-point constant times the molality of the solution the molal freezing-point constant used is the constant for the solvent, not the solute in this experiment, the molar mass of sulfur will be determined using the colligative property law. Lab 9 molar mass by freezing point depression due jul 10, 2017 by 8am points 100 submitting a good answer edit rating delete rating 30 pts. Molar mass from freezing point depression introduction: when a pure substance freezes, the individual particles (molecules, atoms, ions) must organize themselves.
Conclusion: the purpose of this experiment was to determine the molar mass of an unknown, non-volatile solute this molar mass was determined to be 16051 g/mol the cooling curves for the solutions were generally accurate, and resulted in a realistic molar mass, which means this lab was a success. Experiment 4: freezing point depression 43 purpose: an unknown solid is to be identified from a list of possible compounds by its molar mass, which is determined by freezing point depression. General chemistry i (fc, 09 - 10) lab # 13 - molecular weight determination by freezing point depression revised 8/19/2009 3 to find the intersection of the two lines, solve the two equations, 4 and 5, simultaneously for y. Molecular mass by freezing point depression lab fp1 juniata college science outreach new and improved introductory manual, 2000 introduction once a solution has been formed, the solution displays properties different from those of.