Find the structural formulas for salicylic acid, acetic anhydride, and aspirin. Use these structural formulas to construct a reaction equation describing the synthesis of aspirin. (CH3CO)2O + HOC6H4COOH → CH3CO2C6H4CO2H + CH3COOH acetic anhydride salicylic acid acetylsalicylic acid acetic acid
- Find the structural formulas for salicylic acid, acetic anhydride, and aspirin. Use these structural formulas to construct a reaction equation describing the synthesis of aspirin.
(CH3CO)2O
+
HOC6H4COOH
→
CH3CO2C6H4CO2H
+
CH3COOH
acetic anhydride
salicylic acid
acetylsalicylic acid
acetic acid
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 |
Water (mL) |
|
1 |
10 |
0.301 |
0 |
|
2 |
7.5 |
0.219 |
2.5 |
|
3 |
5.0 |
0.163 |
5.0 |
|
4 |
2.5 |
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) |
2.029g |
|
Actual mass of aspirin in sample (g) |
3.256g |
|
Percent aspirin in sample (%) |
62.31% |
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