Question

TAL 1. (20pts) A student reacted 4.0 g of 2-hydroxybenzoic acid (C H6O3, MW 138 g/mol) with 4.0 mL of acetic anhydride (CH603, MW 102 g/mol) and 1 g of concentrated sulfuric acid.(MW 98) After workup, the student isolated 2.5 g of aspirin (MW 180). The density of acetic anhydride is 1.08 g/mL. (atomic weights: C. 12, H 1; 0, 16, S. 32) 1a. The limiting reagent is a) 2-hydroxybenzoic acid b) acetic anhydride c) sulfuric acid d) aspirin 1B The theoretical yield of aspirin in grams is a) 7.62 b) 1.84 c) 5.22 d) not enough information 1C The % yield of aspirin is? 47.9 32.8 18.4 not enough information ID The main purpose of dissolving the crude aspirin in sodium bicarbonate and then IS-precipitating with HCl was to? to neutralize the H2SO4 to remove the polymer to remove unreacted starting materials

just need answer, which letter.

Answer 1

The molecular weight of C₃H2O3 = 138.00 g/mole The molecular n n Cq Ho O₂ = 102 1 4 H6O₃ = 102.9/mole The molecular weight reight of of H₂SO4 = 98 H₂SO4 = 98 g/mole 4 gm of eqH6O3 = 4 h . 4 am of Cu H6O3 = 4 i om of H2SO4 = 0: 0289 mole 20.0392 mole = 001020 mule

a) The limilit meagent a 2-hydroxybenzoic acid By I mole of 2-hydroxybenzoic acid produe S = 1 mole of Aspirin. -0.02898 mole of " = 0.02898 mule Aspirin Aspirin =180 g/mol The molecular weight of The theoritical yield = 0.02898 8180 = 5.22gmas Ary e) % yield - Actual yield Theoretical yield w X 100 2:5_X100 5:22 = 47.9] Any The main purpose of dissolving the crude aspinin in sodium bicarbonate and then be. Precipitating with Hel was to → 6) To neutroalize the H₂ Sou