Experiment 18 Cooling Curves and Crystal Structures A. Cooling Curves of lauric acid 1. Mass of test tube 2. Mass of test tube + lauric acid 3. Mass of lauric acid 1.00 44°C 7.00 41°C 13.00 39 1.50 44°C 7.50 41°C 13.50 39 2.00 43°C 8.00 41°C 14.00 39 21.25 g 2.50 42°C 8.50 40°C 14.50 39 25.51 g 3.00 42°C 9.00 40°C 15.00 39 3.99g 3.50 41°C 9.50 40°C 15.50 39 4.00 41°C 10.00 40°C 16.00 39 Time (min.) Temp (°C) Time (min.) Temp (°C) Time (min.) Temp (°C) 4.50 41°C 10.50 39°C 16.50 389 0.00 50°C 6.00 45°C 12.00 44°C 5.00 41°C 11.00 39°C 17.00 389 0.50 47°C 6.50 45°C 12.50 44°C 5.50 41°C 11.50 39°C 17.50 38° 1.00 47°C 7.00 45°C 13.00 44°C 7. Melting point for LA+BA= 45°C 41°C=46°C 1.50 47°C 7.50 45°C 13.50 44°C 2.00 47°C 8.00 44°C 14.00 44°C Cooling curve of Lauric + Benzoic Acid 2.50 45°C 8.50 44°C 14.50 44°C Temp vs. Time 3.00 45°C 9.00 44°C 15.00 44°C 60 3.50 45°C 9.50 44°C 15.50 4.00 45°C 10.00 44°C 16.00 4.50 45°C 10.50 44°C 16.50 150 5.00 45°C 11.00 44°C 17.00 5.50 45°C 11.50 44°C 17.50 4. Plot the temperature versus time and determine the melting point of lauric acid. Insert graph here. I determined the melting point to be at 45°C 51 50 49 48 47 46 45 44 2 & 3 4 5 9 9 39 Temperature °C Cooling Curve of Lauric Acid Temp vs. Time 43 0 4 10 12 14 Time (min.) 5. Mass of test tube + lauric acid + benzoic acid 6. Mass of benzoic acid 25.85g 0.34 g Time (min) Temp (°C) Time (min.) Temp (°C) 0.00 50°C 6.00 41°C Time (min.) 12.00 Temp (°C) 39°C 0.50 44°C 6.50 41°C 12.50 39°C Tepmperature °C 40 40 20 10 O 2 8 8 10 12 24 16 18 20 Time (min) 8. Freezing point depression (At) 9. Molality of solution (k for lauric acid is 4.40 °C kg/mol) 10. Moles of solute in original sample 11. Molecular mass of benzoic acid from freezing point depression 12. Molecular mass of benzoic acid from formula (CHO) 13. Percent error 14. Suggest explanations for the percent error °C mol/kg mol gmol gmol
Experiment 18 Cooling Curves and Crystal Structures A. Cooling Curves of lauric acid 1. Mass of test tube 2. Mass of test tube + lauric acid 3. Mass of lauric acid 1.00 44°C 7.00 41°C 13.00 39 1.50 44°C 7.50 41°C 13.50 39 2.00 43°C 8.00 41°C 14.00 39 21.25 g 2.50 42°C 8.50 40°C 14.50 39 25.51 g 3.00 42°C 9.00 40°C 15.00 39 3.99g 3.50 41°C 9.50 40°C 15.50 39 4.00 41°C 10.00 40°C 16.00 39 Time (min.) Temp (°C) Time (min.) Temp (°C) Time (min.) Temp (°C) 4.50 41°C 10.50 39°C 16.50 389 0.00 50°C 6.00 45°C 12.00 44°C 5.00 41°C 11.00 39°C 17.00 389 0.50 47°C 6.50 45°C 12.50 44°C 5.50 41°C 11.50 39°C 17.50 38° 1.00 47°C 7.00 45°C 13.00 44°C 7. Melting point for LA+BA= 45°C 41°C=46°C 1.50 47°C 7.50 45°C 13.50 44°C 2.00 47°C 8.00 44°C 14.00 44°C Cooling curve of Lauric + Benzoic Acid 2.50 45°C 8.50 44°C 14.50 44°C Temp vs. Time 3.00 45°C 9.00 44°C 15.00 44°C 60 3.50 45°C 9.50 44°C 15.50 4.00 45°C 10.00 44°C 16.00 4.50 45°C 10.50 44°C 16.50 150 5.00 45°C 11.00 44°C 17.00 5.50 45°C 11.50 44°C 17.50 4. Plot the temperature versus time and determine the melting point of lauric acid. Insert graph here. I determined the melting point to be at 45°C 51 50 49 48 47 46 45 44 2 & 3 4 5 9 9 39 Temperature °C Cooling Curve of Lauric Acid Temp vs. Time 43 0 4 10 12 14 Time (min.) 5. Mass of test tube + lauric acid + benzoic acid 6. Mass of benzoic acid 25.85g 0.34 g Time (min) Temp (°C) Time (min.) Temp (°C) 0.00 50°C 6.00 41°C Time (min.) 12.00 Temp (°C) 39°C 0.50 44°C 6.50 41°C 12.50 39°C Tepmperature °C 40 40 20 10 O 2 8 8 10 12 24 16 18 20 Time (min) 8. Freezing point depression (At) 9. Molality of solution (k for lauric acid is 4.40 °C kg/mol) 10. Moles of solute in original sample 11. Molecular mass of benzoic acid from freezing point depression 12. Molecular mass of benzoic acid from formula (CHO) 13. Percent error 14. Suggest explanations for the percent error °C mol/kg mol gmol gmol
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Hello, I desperately need help figuring out 8-14; I also wanted to see if you would mind letting me know if I picked the right degree as my melting points on the two graphs. Please and thank you in advance! All the information is provided.
Transcribed Image Text:Experiment 18 Cooling Curves and Crystal Structures
A. Cooling Curves of lauric acid
1. Mass of test tube
2. Mass of test tube + lauric acid
3. Mass of lauric acid
1.00
44°C
7.00
41°C
13.00
39
1.50
44°C
7.50
41°C
13.50
39
2.00
43°C
8.00
41°C
14.00
39
21.25 g
2.50
42°C
8.50
40°C
14.50
39
25.51 g
3.00
42°C
9.00
40°C
15.00
39
3.99g
3.50
41°C
9.50
40°C
15.50
39
4.00
41°C
10.00
40°C
16.00
39
Time (min.)
Temp (°C)
Time (min.)
Temp (°C)
Time (min.)
Temp (°C)
4.50
41°C
10.50
39°C
16.50
389
0.00
50°C
6.00
45°C
12.00
44°C
5.00
41°C
11.00
39°C
17.00
389
0.50
47°C
6.50
45°C
12.50
44°C
5.50
41°C
11.50
39°C
17.50
38°
1.00
47°C
7.00
45°C
13.00
44°C
7. Melting point for LA+BA= 45°C 41°C=46°C
1.50
47°C
7.50
45°C
13.50
44°C
2.00
47°C
8.00
44°C
14.00
44°C
Cooling curve of Lauric + Benzoic Acid
2.50
45°C
8.50
44°C
14.50
44°C
Temp vs. Time
3.00
45°C
9.00
44°C
15.00
44°C
60
3.50
45°C
9.50
44°C
15.50
4.00
45°C
10.00
44°C
16.00
4.50
45°C
10.50
44°C
16.50
150
5.00
45°C
11.00
44°C
17.00
5.50
45°C
11.50
44°C
17.50
4. Plot the temperature versus time and determine the melting point of lauric acid. Insert
graph here.
I determined the melting point to be at 45°C
51
50
49
48
47
46
45
44
2 & 3 4 5 9 9 39
Temperature °C
Cooling Curve of Lauric Acid
Temp vs. Time
43
0
4
10
12
14
Time (min.)
5. Mass of test tube + lauric acid + benzoic acid
6. Mass of benzoic acid
25.85g
0.34 g
Time (min)
Temp (°C)
Time (min.)
Temp (°C)
0.00
50°C
6.00
41°C
Time (min.)
12.00
Temp (°C)
39°C
0.50
44°C
6.50
41°C
12.50
39°C
Tepmperature °C
40
40
20
10
O
2
8
8
10
12
24
16
18
20
Time (min)
8. Freezing point depression (At)
9. Molality of solution (k for lauric acid is 4.40 °C kg/mol)
10. Moles of solute in original sample
11. Molecular mass of benzoic acid from freezing point depression
12. Molecular mass of benzoic acid from formula (CHO)
13. Percent error
14. Suggest explanations for the percent error
°C
mol/kg
mol
gmol
gmol
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