Determine the percent yield of the synthesis.
The % yield = 81.33 %
The Theoretical Yield = 2.65g
The Actual Yield = 3.256g
Part I Synthesis of Aspirin
|
Mass of salicylic acid used (g) |
2.029g |
|
Volume of acetic anhydride used (mL) |
5ml |
|
Mass of acetic anhydride used (vol. × 1.08 g/mL) |
5.4g |
|
Mass of aspirin synthesized (g) |
3.256g |
Part II Melting Temperature Data
|
Melting temperature (°C) |
133°C |
Part III Salicylic Acid Standard Stock Solution
|
Initial mass of salicylic acid (g) |
0.210g |
|
Moles of salicylic acid (mol) |
0.0147mol |
|
Initial molarity of salicylic acid (M) |
0.724 M |
Part III Beer’s Law Data for Salicylic Acid Standard Solutions
|
Trial |
Concentration |
Absorbance |
Water (mL) |
|
1 |
0.724 M |
0.301 |
0 |
|
2 |
0.724 M |
0.219 |
2.5 |
|
3 |
0.724 M |
0.163 |
5.0 |
|
4 |
0.724 M |
0.074 |
7.5 |
|
Best-fit line equation for the salicylic acid standards |
|
Test of the Purity of the Synthesized Aspirin
|
Initial mass of aliquot of product (g) |
0.210g |
|
Absorbance of sample prepared from aliquot |
0.081 |
|
Moles of salicylic acid in sample (mol) |
138.121 g/mol |
|
Mass of salicylic acid in sample (g) |
2.029 g |
|
Actual mass of aspirin in sample (g) |
3.256 |
|
Percent aspirin in sample (%) |
|
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