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) 2.029g Actual mass of aspirin in sample (g) 3.256g Percent aspirin in sample (%)
The melting temperature of pure acetylsalicylic acid is 135 degrees Celsius.
Based on the results of the melting temperature test, what is the percent purity of your sample of aspirin?
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) |
0.0147 mol |
|
Initial molarity of salicylic acid (M) |
0.724 M |
Part III Beer’s Law Data for Salicylic Acid Standard Solutions
|
Trial |
Concentration |
Absorbance |
|
1 |
10 |
0.301 |
|
2 |
7.5 |
0.219 |
|
3 |
5.0 |
0.163 |
|
4 |
2.5 |
0.074 |
|
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) |
2.029g |
|
Actual mass of aspirin in sample (g) |
3.256g |
|
Percent aspirin in sample (%) |
|
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