Freezing Point of pure TBA (experimentally determined) = 22.90 °C. 8.09 (C)(kg solvent) mol solute Molal Freezing Point Depression Constant 0'00" (0.00) 37.00 0'15" (0.25) 31.40 0'30" (0.50) 27.50 0'45" (0.75) 23.80 1'00" (1.00) 21.00 1'15" (1.25) 18.80 1'30" (1.50) 16.60 Data-Freezing Point with 1" addition of Solute Time min'sec" Temperature Time min'sec" Temperature (decimal) (°C) (decimal) (°C) Freezing Point Data A Time (min) Temp ( 0.00 0.25 0.50 0.75 1.00 1.25 1.50 16.60 1.75 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 6.00 37.00 Freesing Point Data B 31.40 Time (min) Temp (C) 27.50 0.50 23.80 21.00 18.80 ml -13.271 61 35.111 Intersection Temp 0.75 1.00 1.25 1.50 1.75 15.50 2.00 15.00 2.50 14.50 3.00 3.50 4.00 4.50 13.70 13.00 12.20 11.60 5.00 11.00 5.50 10.40 6.00 9.80 m2 -1.35 62 17.75 15.79 °C 1'45" (1.75) 15.50 2'00" (2.00) 15.00 2'30" (2.50) 14.50 3'00" (3.00) 13.70 3'30" (3.50) 13.00 4'00" (4.00) 12.20 4'30" (4.50) 11.60 40.00 35.00 30.00 Brookhaven College Chemistry - v6a 25.00 20.00 15.00 10.00 5.00 ■ 0.00 TBA ; k, = 1.00 y-13271 35.411 2.00 Freezing Point Determination Temperature (°C) vs Time (min) 1.00 Time min'sec" Temperature (decimal) (°C) 5'00" (5.00) 11.00 5'30" (5.50) 10.40 6'00" (6.00) 9.80 4.00 Time (min) Molal Freezing Point Depression Constant, k, for TBA= Page 1 of 12 ya-1.3457x + 17,75 a) What is the freezing point of the solution? b) What is the molar mass of the unknown? 2. Construct a Data Table for the collection of your experimental data. Hint: Read your experiment carefully to determine what data you will need to collect and organize it so that it will be easy to use and follow throughout your experiment. Pre-Lab Question I may give you some ideas on how to construct the data sheet. 8.09 5.00 The one constant that you will need to include is the Molal Freezing Point Depression Constant for TBA. 6.00 1/7/2020 7.00 (C)(kg solvent) mol solute X2068
Freezing Point of pure TBA (experimentally determined) = 22.90 °C. 8.09 (C)(kg solvent) mol solute Molal Freezing Point Depression Constant 0'00" (0.00) 37.00 0'15" (0.25) 31.40 0'30" (0.50) 27.50 0'45" (0.75) 23.80 1'00" (1.00) 21.00 1'15" (1.25) 18.80 1'30" (1.50) 16.60 Data-Freezing Point with 1" addition of Solute Time min'sec" Temperature Time min'sec" Temperature (decimal) (°C) (decimal) (°C) Freezing Point Data A Time (min) Temp ( 0.00 0.25 0.50 0.75 1.00 1.25 1.50 16.60 1.75 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 6.00 37.00 Freesing Point Data B 31.40 Time (min) Temp (C) 27.50 0.50 23.80 21.00 18.80 ml -13.271 61 35.111 Intersection Temp 0.75 1.00 1.25 1.50 1.75 15.50 2.00 15.00 2.50 14.50 3.00 3.50 4.00 4.50 13.70 13.00 12.20 11.60 5.00 11.00 5.50 10.40 6.00 9.80 m2 -1.35 62 17.75 15.79 °C 1'45" (1.75) 15.50 2'00" (2.00) 15.00 2'30" (2.50) 14.50 3'00" (3.00) 13.70 3'30" (3.50) 13.00 4'00" (4.00) 12.20 4'30" (4.50) 11.60 40.00 35.00 30.00 Brookhaven College Chemistry - v6a 25.00 20.00 15.00 10.00 5.00 ■ 0.00 TBA ; k, = 1.00 y-13271 35.411 2.00 Freezing Point Determination Temperature (°C) vs Time (min) 1.00 Time min'sec" Temperature (decimal) (°C) 5'00" (5.00) 11.00 5'30" (5.50) 10.40 6'00" (6.00) 9.80 4.00 Time (min) Molal Freezing Point Depression Constant, k, for TBA= Page 1 of 12 ya-1.3457x + 17,75 a) What is the freezing point of the solution? b) What is the molar mass of the unknown? 2. Construct a Data Table for the collection of your experimental data. Hint: Read your experiment carefully to determine what data you will need to collect and organize it so that it will be easy to use and follow throughout your experiment. Pre-Lab Question I may give you some ideas on how to construct the data sheet. 8.09 5.00 The one constant that you will need to include is the Molal Freezing Point Depression Constant for TBA. 6.00 1/7/2020 7.00 (C)(kg solvent) mol solute X2068
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ISBN:9781337399425
Author:Steven S. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Donald J. DeCoste
Chapter15: Solutions
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