Salicylic acid acetic anhydride acetylsalicylic acid acetic...

Salicylic Acid + Acetic Anhydride ---> Acetylsalicylic Acid + Acetic Acid C7H6O3 + C4H6O3 -----> C9H8O4 + C2H4O2 1. What is the limiting reagent and the theoretical yield of the above reaction if 1.00 g of salicylic acid is reacted with 1.00 mL of acetic anhydride? 2. If 0.82 g of aspirin were obtained in the reaction, what is the percent yield? 3. If the percent yield of the reaction is reported as 76.8%, how much salicylic acid is required to isolate 1.00 g of aspirin? 4. If 0.100 mol of salicylic acid is reacted with 2.2 molar equivalents of acetic anhydride, how much acetic anhydride, in mL, should be added to the reaction vessel?

Transcript

00:01 Hello students in this question we have been given an equation and we have been asked about it stoichiometry first we will have to calculate the molar mass of all the reactants and products the molar mass for salicylic acid is 138 grams for acetic anhydride it is 102 grams for aspirin or acetyl cellic acid the molar mass is 180 grams for acetic acid the molar mass is 60 grams for the first part we have to find out the limiting reagent 138 grams of acid reacts with 102 grams of acetic anhydride we have been given 1 gram of acid and 1 ml of acetic anhydride will have to convert this volume to mass.

01:12 Using the formula, density is equal to mass divided by volume.

01:18 The density for acetic is 1 .08 gram per ml which is equal to mass in grams divided by volume in milliliters.

01:33 Hence the mass of acetic anhydride that is taken for the rate, reaction is 1 .08 grams.

01:45 Hence, 1 gram of acid is reacting with 1 .08 grams of acetic anhydride.

02:00 But according to the stoichiometry, 1 gram of acid reacts with 102 divided by 138 grams of acetic anhydride, which is equal to 0 .73 grams.

02:27 Hence, we can say that the cellic acid is limiting reagent as it is in smaller quantity.

02:44 In the next part, we have to calculate the percentage yield.

02:49 Percentage yield equals the actual mass of product that has been isolated divided by its theoretical mass.

03:05 Multiplied by 100.

03:09 138 grams of acid produce 180 grams aspirin.

03:25 We are given with 1 gram of acid.

03:31 It will produce 180 divided by 138 grams of aspirin...

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