Exercise 8.71 Part A Aspirin can be made in the laboratory by reacting acetic an

Question

Exercise 8.71 Part A Aspirin can be made in the laboratory by reacting acetic anhydride (C4H6 O3) with salicylic acid (C7H6 O3) to form aspirin (C9Hs O4) and acetic acid (C2H4 02 The balanced equation is Determine the limiting reactant for the reaction. acetic anhydride salicylic acid In a laboratory synthesis, a student begins with 3.10 mL of acetic anhydride (density = 1.08 g/ml) and 1.24 g of salicylic acid. Once the reaction is complete the student collects 1.21 g of aspirin Submit My Answers Give Up Part B Determine the theoretical yield of aspirin for the reaction. m= Submit My Answers Give Up Part C Determine the percent yield of aspirin for the reaction. Submit My Answers Give Up

Explanation / Answer

Ac.Anh + Sal.Acid = Aspirin + Ac.Acid

V = 3.10 ml Ac.Ahn

D = 1.08 g/ml

m = D*V = 3.10*1.08 = 3.1 g of Ac.Ahn

MW Ac.Ahn = 102.09

mol Ac.Ahn = 3.1/102.09 = 0.03036536 mol A.A

m = 1.2 g of Sal.Acid

MW Sal.Acid = 138.121

mol = mass/MW = 1.2/138.121 = 0.0086880344

since ratio is 1:1

0.03036536 mol of A.A will react and dissapear completely

therefore

Acetic Anhydride is the limiting reactant

B)

theoretical yield

if

0.03036536 mol of A.A react

then we form 0.03036536 mol of Aspirin (1-1 ratio)

MW asprini = 180.157

mass of Aspirin = mol*MW = 0.03036536 *180.157 = 5.4705 g of aspirin

theoretical yield = 5.4705 g

C)

% yield = real/theoretical * 100% = 1.21/5.4705*100 = 22.11863 %

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