aspirin-results

Back to Prep of Aspirin Home

The limiting reactant of the reaction to prepare aspirin is the salicylic acid. (See "Procedure") for these calculations. Therefore, the theoretical yield can be calculated: __ Group 1 __ 1.01 grams salicylic acid (1 mol / 138.1 grams) * (1 mol salicylic acid / 1 mol aspirin) * (180.2 grams aspirin / 1 mol) = 1.318 grams aspirin Final mass of crystallized aspirin product produced from our reaction = 0.2688 grams

% Yield = Actual Yield / Theoretical Yield x 100 % Yield = 0.2688 grams aspirin / 1.318 grams aspirin x 100 = 20.4%

Melting point of product: 126.6-129.4 degrees C (literature value = 135 degrees C)

Group 1 IR and NMR

__ Group 2 __
 * Theoretical Yield (g) || 1.37 ||
 * Actual Yield (g) || 0.5621 ||
 * Actual % Yield || 41.01 ||
 * Melting Point (DEG C) || 140.2-142.4 ||

Figure 1. HNMR spectrum of aspirin obtained in lab

Figure 2. HNMR of aspirin from SDBS databasse.