Aspirin Data Sheet Week 1 Mass of 125 mL Flask (g) 2 Mass of Flask and Salicylic

Question

Aspirin Data Sheet Week 1 Mass of 125 mL Flask (g) 2 Mass of Flask and Salicylic Acid (g) oya 16 g 3 Mass of Salicylic Acid (g) Volume of Acetic Anhydride (mL) 6 Density of acetic anhydride: 1.082 g/ mL Mass of Acetic of Acetic Anhydride Gua 5 pts nia Moles of Salicylic Acid 7 Moles of Acetic Anhydride Limiting Reagent Show Calculations (15 pts) What is the Mole ration between the 9 limiting Reagent and Aspirin Theoretical Moles of Aspirin (5 pts imiting Reagent and Theoretical Mole calculations for Aspirin

Explanation / Answer

Salicylic acid + Acetic anhydride -----------> Aspirin + Acetic acid

Moles of salicylic acid = mass / molar mass = 2.98 / 138.12 = 0.0216 mol

Moles of acetic anhydride = mass / molar mass = 6.497 / 102.09 = 0.0636 mol

From the balalnced equation shown above,

1 mol salicylci acid needs 1 mol acetic anhydride.

So, salicylic acid is limiting reagent. Because 0.0216 < 0.0636

Moles of aspirin formed = 0.0216 mol

So, theoretical moles of aspirin = 0.0216 mol

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