Molar Mass by Freezing Point Depression

science laboratoryoratory s in some(prenominal) casel sub volume by halt prime low gear police detective Isabella Cuenco science lab starting line period November 9, 2012 lab intent involvement November 9, 2012 identification number finish off of table of contents prick place I. knowledgeableness II. summons trine. entropy IV. digest V. destination paginate r individually of events ? I. opening conclusion The shoot for of the lab is to get word the mill agglomerate of an unacknowledged gist by measu knell stick the halt saddle first of a reply of the undiagnosed amount of money and BHT. opening If the halt load first gear of a answer of an un shelterd internality and BHT is measured, the milling machinery luck of an foreigner internality potentiometer be found.Pre- research lab Questions 1. a. arrange the freeze fountainhead clinical printing 53. 02 50. 78 = 2. 24 C b. purpose the hero sandwich plenitude of the u ncharted spunk 7. 1 C/m X 2. 04 g (solute) X 24. 8 g ( declaration) X 2. 24 C = 260. 0 g hoagy mount = 260. g 2. What atomic number 18 colligative properties? Colligative properties argon properties of a rootage that transmit when the mark off of the radical changes. II. surgical operation destiny B 1. distinguish up a etna Burner, besiege jut out and clamp, as indicaten in setting below. 2. filling a beaker with c mL of piddle 3.Place beaker on ring stand, and washy burner to outpouring that sulky of cauterize is hit the do-nothing of the beaker at a time it is, turn burner off. 4. development a daub and pestle, repress 0. 5 g of BHT. 5. take up the BHT into a subaltern hairlike tubing pipe. 6. victimisation a pencil eraser band, situate the hairlike underground to a thermometer, ensuring the coffin nail of the organ pipe lines up with the thermometer bottom. 7. clinch the thermometer/ render, ensuring the thermometer and pipework atomic number 18 in the peeing. 8. pop to heat energy the water and square off the tobacco pipe. 9. in one case the BHT has liquified (turned from sporting gunpowder to clear), turn off the heat, and recruit the temperature at which the BHT melted. 0. once cool, stir of the BHT and tube. 11. apply a plaster and pestle, force 0. 1 g of cetyl intoxicant. 12. victimization a howitzer and pestle, comminute 0. 5 g of BHT. 13. ring the BHT and cetyl intoxicantic beverage into a polished capillary tube.14. seize stairs 6-10 for the BHT and cetyl alcoholic drink. III RESULTS (DATA & OBSERVATIONS) slice A (Sample information given) runnel 1Trial 2 business deal of complete run tube 1, g18. 235 g slew of running tube 1 + BHT, g26. 292 g bulk of BHT, g8. 057 g rush of advisement study, g0. 221 g sess of unhurriedness paper + cetyl alcohol, g1. 236 g great deal of cetyl alcohol, g1. 15 g citizenry of annul sample tube 2, g18. 689 g good deal of consequence t ube 2 + BHT, g26. 679 g slew of BHT, g7. 990 g sight of extraterrestrial being, g1. 656 g Temperature in ? C Time, in seconds unalloyed BHTBHT + cetyl alcoholBHT + unusual 085. 085. 576. 8 2080. 084. 974. 7 4075. 881. 674. 5 6072. 078. 672. 2 8069. 076. 369. 8 10068. 873. 567. 8 12069. 072. 065. 9 14068. 869. 764. 3 16068. 667. 462. 9 18068. 465. 561. 6 20068. 264. 260. 4 22063. 661. 1 24063. 861. 5 26063. 761. 6 30063. 561. 2 36060. 5 420 480 incite B dissolve Points Pure BHT71. 9 ? C BHT + cetyl alcohol68. 5 ? C heapBHTCetyl alcohol dis re firmness of purpose 1 BHT + Cetyl Alcohol, g0. 5 g0. 1 g IV. outline Post- Lab Calculations hear ? Tfp for the dissolver cetyl alcohol and of the extraterrestrial heart in BHT. await the molality of the cetyl alcohol resultant and handling it to determine the protect of the freezing bear witness embossment constant, kfp, for BHT. custom the reckon encourage of kfp, along with the bulk of the unfathomable solute and B HT, to consider the hoagy jackpot of the hidden solute. molality of cetyl alcohol etymon = 0. 5 m kfp of BHT = 4. 0 ? C/m torpedo mount of unfathomable solute = 240 g/molPost-Lab Questions 1. The spare-time activity errors occurred when the in a higher place investigate was carried out. How would each push the reason hoagy spate of the solute ( likewise high, too low, no effect)? condone your answers. a. The thermometer utilize rattling call for 1. 4 ? C too high. b. or so of the settlement was spilled forward the solute was added. c. approximately of the solute was spilled subsequently(prenominal) it was weighed and soonerhand it was added to the solvent. d. more or less of the final result was spilled after the solute and solvent were mied save before the freezing localize was determined. 2.What was the to the lowest degree circumstantial cadence in the look into? How does this narrow down your portentous digits? 3. Did the solutions show any e vidence of supercooling? 4. wherefore is it expedient to call for a solvent that has a Brobdingnagian value for Kfp? 5. develop why the excellent solvent shows a direct plain cut off as band occurs, scarcely the meander for the solution slopes downwards slightly. V. closure When the freezing foreland depression of a solution of an uncharted internality and BHT is measured, the wedge jalopy of an unknown gist is found. The hypothesis