The Synthesis and Analysis of Aspirin Law Data for Salicylic Acid Standard Solut

Question

The Synthesis and Analysis of Aspirin Law Data for Salicylic Acid Standard Solutions Absorbance Trial Concentration (M) 2 4134 I 240 X 4 1,15 XI 312 Best-fit line equation for the salicylic acid standards |?1g2xtabl72q Test of the Purity of the Synthesized Aspirin dry weigh 138o Initial mass of aspirin sample (g) Absorbance of aspirin sample Moles of salicylic acid in aspirin sample (mol) Mass of salicylic acid in aspirin sample (g) Mass of aspirin in sample (g) Percent aspirin in sample (%) ,o50 ! ,la mole DATA ANALYSIS 1. What is the theoretical yield of aspirin in your synthesis? The mole ratio is 1:1 between salicylic acid and acetic anhydride in this reaction. The melting temperature of pure acetylsalicylic acid is 135°C, Based on the results of the melting temperature test, what is the percent purity of your sample of aspirin? 2. 13 lo

Explanation / Answer

Mass of Salicylic acid ( C7H6O3) in aspirin sample = moles x molecular weight

= 0.197 mol x 138.121 g/mol

= 27.227 g

% aspirin in sample = mass of aspirin x 100 / initial mass of aspirin sample

= 0.40 x 100 / 1.76

= 22.727 %

Moles of aspirin = moles of Salicylic acid consumed

= 0.197 mol

Mass of aspirin (C9H8O4) = moles x molecular weight

= 0.197 g x 180.157 g/mol

= 35.49 g

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