A student in another laboratory section worked on the Atkinsonaspirin project sy

Question

A student in another laboratory section worked on the Atkinsonaspirin project synthesized some aspirin and determined its purityfollowing the instructions. Here is the data he collected: mass of product sample titrated: 0.301g concentration of sodium hydroxide: 0.102M initial volume of sodium hydroxide: 4.89mL final volume of sodium hydroxide: 19.32mL a). how many grams of aspirin are in the product sampletitrated? ( 1 mole of aspirin reacts with 1 mole of sodiumhydroxide) equation: salicylic acid+acetic anhydride goes to aspirin+acetic acid also, is salicylic acid the liminting reactant? why? thanx A student in another laboratory section worked on the Atkinsonaspirin project synthesized some aspirin and determined its purityfollowing the instructions. Here is the data he collected: mass of product sample titrated: 0.301g concentration of sodium hydroxide: 0.102M initial volume of sodium hydroxide: 4.89mL final volume of sodium hydroxide: 19.32mL a). how many grams of aspirin are in the product sampletitrated? ( 1 mole of aspirin reacts with 1 mole of sodiumhydroxide) equation: salicylic acid+acetic anhydride goes to aspirin+acetic acid also, is salicylic acid the liminting reactant? why? thanx

Explanation / Answer

Mass of sample = 0.301 g Volume of NaOH used = Final Volume - Initial volume                                     =19.32 mL - 4.89 mL                                     =14.43 mL Molarity of NaOH = 0.102 M . Moles of NaOH = Molarity * volume (L)                           =0.102 M * 14.43 mL / 1000                           =0.00147 moles . Since one mole of aspirin reacts with 1 mole of NaOH, moles of aspirin = 0.00147 moles . Mass of aspirin = moles * molar mass                         =0.00147 moles * 180.15 g/mol                         =0.265 g . This is the mass of aspirin in the product sampletitrated. . Whether salicylic acid is the limiting reactant or not dependson the amounts of the reactants salicylic acid and aceticanhydride. Since both react in a 1:1 ratio, whichever has the lowernumber of moles will be the limiting reactant.

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