26 Remove the test tube from the water bath and record the temperature This

# 26 remove the test tube from the water bath and

• 12
• 33% (3) 1 out of 3 people found this document helpful

This preview shows page 3 - 9 out of 12 pages.

26. Remove the test tube from the water bath and record the temperature. This will be the temperature at time 0. 27. Record the temperature every 20 seconds until a plateau in temperature is reached, usually after 15 minutes. 28. Make a record on the data table of the temperature at which the solid crystals first appear in the test tube. 29. After a plateau has been reached, place the test tube back in the water bath. Allow the mixture to melt. Once the mixture has melted, remove the thermometer and immediately clean the thermometer with paper towel. 30. The test tube and contents should be removed from the water bath and placed in the glass waste container at the front of the room labeled, Lauric acid/Benzoic acid waste. DO NOT PUT LAURIC ACID DOWN THE DRAIN. IT WILL SOLIDFY AND CLONG THE SINKS!
Experiment #1: Determination of Molar Mass using Freezing Point Depression 4 Data Sheets – Trial #1 Lauric Acid Mass of weigh boat: ___________________ Mass of lauric acid: _________________ Mass of weigh boat after the lauric acid has been added:____________ Mass of lauric acid added to the test tube:_______________ Time (sec) Temperature Time (sec) Temperature 0 380 20 400 40 420 60 440 80 460 100 480 120 500 140 520 160 540 180 560 200 580 220 600 240 620 260 640 280 660 300 680 320 700 340 720 360 740
Experiment #1: Determination of Molar Mass using Freezing Point Depression 5 Data Sheets – Trial #2 Lauric Acid Mass of weigh boat: ___________________ Mass of lauric acid: _________________ Mass of weigh boat after the lauric acid has been added:____________ Mass of lauric acid added to the test tube:_______________ Time (sec) Temperature Time (sec) Temperature 0 380 20 400 40 420 60 440 80 460 100 480 120 500 140 520 160 540 180 560 200 580 220 600 240 620 260 640 280 660 300 680 320 700 340 720 360 740
Experiment #1: Determination of Molar Mass using Freezing Point Depression 6 Data Sheets – Trial #1 Lauric Acid/Benzoic Acid Mass of weigh boat: ___________ Mass of benzoic acid: ____________ Mass of weigh boat after the benzoic acid has been added:____________ Mass of benzoic acid added to the test tube:_______________ Time (sec) Temperature Time (sec) Temperature 0 520 20 540 40 560 60 580 80 600 100 620 120 640 140 660 160 680 180 700 200 720 220 740 240 760 260 780 280 800 300 820 320 840 340 860 360 880 380 900 400 920 420 940 440 960 460 980 480 1000 500 1020
Experiment #1: Determination of Molar Mass using Freezing Point Depression 7 Data Sheets – Trial #2 Lauric Acid/Benzoic Acid Mass of weigh boat: ___________ Mass of benzoic acid: ____________ Mass of weigh boat after the benzoic acid has been added:____________ Mass of benzoic acid added to the test tube:_______________ Time (sec) Temperature Time (sec) Temperature 0 520 20 540 40 560 60 580 80 600 100 620 120 640 140 660 160 680 180 700 200 720 220 740 240 760 260 780 280 800 300 820 320 840 340 860 360 880 380 900 400 920 420 940 440 960 460 980 480 1000 500 1020