Using the percent purity calculations, determine the percent yield of synthesis 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 (M) 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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Using the percent purity calculations, determine the percent yield of synthesis 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
(M)

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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