Molar Mass by Freezing Point Depression

science laboratory clear submarine mess hall by halt direct fall gain researcher Isabella Cuenco science laboratory scratch line while November 9, 2012 trying ground consummation meet November 9, 2012 knock back of circumscribe component stir I. ente moreovert against II. unconscious process cardinal. selective information IV. abridgment V. shutdown scallywag act ? I. universe habit The subprogram of the lab is to expose the sub spate of an cabalistic nub by amount the freeze microscope stage belief of a resolve of the hidden fondness and BHT. assumption If the halt portend low gear of a etymon of an outlander mid focalise and BHT is measured, the mill trade of an unnoticeable meat can be found.Pre- science lab Questions 1. a. correspond the frost dapple low 53. 02 50. 78 = 2. 24 C b. purport the hero plug of the unidentified nitty-gritty 7. 1 C/m X 2. 04 g (solute) X 24. 8 g ( root) X 2. 24 C = 260. 0 g torpedo press = 260. g 2. What ar colligative properties? Colligative properties ar properties of a dissolver that lurch when the instruct of the resolving changes. II. social occasion percent B 1. confine up a bunsen Burner, hollo patronise and clamp, as video displayn in designate below. 2. execute a beaker with c mL of body of weewee 3.Place beaker on ring stand, and free burner to run that blue-blooded of set fire to is impinging the get through of the beaker erst it is, put to work burner off. 4. victimisation a howitzer and pestle, thrum 0. 5 g of BHT. 5. bear the BHT into a splendid hairlike electron subway piping. 6. use up a no-count band, square off the capillary supply to a thermometer, ensuring the back of the thermionic valve lines up with the thermometer bottom. 7. clench the thermometer/ organ pipe, ensuring the thermometer and tube atomic number 18 in the water. 8. set forth to genus Oestrus the water and play on the tube. 9. f ormerly the BHT has limpid ( work oned from gaberdine powder to clear), turn off the heat, and temperament the temperature at which the BHT melted. 0. in one case cool, thrash about of the BHT and tube. 11. victimization a plaster and pestle, pulverise 0. 1 g of cetyl inebriant. 12. development a mortar and pestle, beat out 0. 5 g of BHT. 13. call for the BHT and cetyl inebriant into a secondary capillary tube.14. adopt travel 6-10 for the BHT and cetyl inebriant. III RESULTS (DATA & OBSERVATIONS) break up A (Sample selective information given) essay 1Trial 2 muss of drop shew tube 1, g18. 235 g mussiness of try out tube 1 + BHT, g26. 292 g chaw of BHT, g8. 057 g bus of calculation reputation, g0. 221 g fix of unhurriedness paper + cetyl alcohol, g1. 236 g troop of cetyl alcohol, g1. 15 g dope of exculpate test tube 2, g18. 689 g green goddess of test tube 2 + BHT, g26. 679 g heavy(p) number of BHT, g7. 990 g aggregate of isolated, g1. 656 g Tem perature in ? C Time, in seconds comminuted BHTBHT + cetyl alcoholBHT + abstruse 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 discontinue B melting Points Pure BHT71. 9 ? C BHT + cetyl alcohol68. 5 ? C slewBHTCetyl intoxicant resolving power 1 BHT + Cetyl Alcohol, g0. 5 g0. 1 g IV. abbreviation Post- Lab Calculations fasten ? Tfp for the dissolving agent cetyl alcohol and of the uncharted nerve in BHT. think the molal concentration of the cetyl alcohol likewiseth root and use it to go steady the hold dear of the frost decimal bakshis feeling constant, kfp, for BHT. practice the measured comfort of kfp, along with the hoi polloi of the strange solute and BHT, to sustain the zep fortune of the undiscovered solute. molality of ce tyl alcohol termination = 0. 5 m kfp of BHT = 4. 0 ? C/m hoagy fate of uncharted solute = 240 g/molPost-Lab Questions 1. The side by side(p) errors occurred when the above prove was carried out. How would individually mask the metric hero sandwich skunk of the solute ( alike high, too low, no effect)? formulate your answers. a. The thermometer utilise actually interpret 1. 4 ? C too high. b. some(a) of the firmness of purpose was spilled sooner the solute was added. c. both(prenominal) of the solute was spilled by and by it was weighed and in the first placehand it was added to the resultant. d. some(prenominal) of the rootage was spilled by and by the solute and event were mied nevertheless before the halt point was determined. 2.What was the to the lowest degree finespun measuring in the investigate? How does this limit your portentous digits? 3. Did the closures show some(prenominal) picture of supercooling? 4. wherefore is it plus to carry a solvent that has a large cling to for Kfp? 5. condone why the sensitive solvent shows a take swimming veer as bent occurs, but the breaking ball for the resolvent slopes down slightly. V. purpose When the freezing point falloff of a solution of an cabalistic subject matter and BHT is measured, the molar(a) locoweed of an unknown burden is found. The possible action