Question

analysis - worksheet page 3: part ii. economic considerations 1. based upon your lab results (your actual yield), calculate the cost to make 1000 grams of aspirin. a. you will need the cost of your raw materials - acetic anhydride and salicylic acid. we can neglect the cost of acid catalyst and water. i. salicylic acid: 500 g = $16.45 ii. acetic anhydride: 500 ml = $11.21 hints: (1) find the scale factor (sf) to go from your actual yield to 1000 g yield, then multiply your actual starting amounts by this scale factor. (2) use unit - conversion factors to convert scaled - up reactant amounts into $ (to nearest cent). 1000/1.00 = sf = 1000 500×1000 = 500,000g 16.45/500×500,000 = 16450 500×1000 = 500,000ml 11.21/500×500,000 = 11210 16450 + 11210 = 27660 = $27.66 b. from the same chemical supplier comes the following data for aspirin powder: 500 g = $31.60. can you beat their price (show working)? if not, suggest two specific reasons why not (think in terms of differences in equipment, methods, recipes). c. optional bonus: calculate the atom economy for this reaction. this is the % of reactant atoms by number that end up in the useful product, other atoms end up in the side - products. the value is an important consideration in “green chemistry” manufacturing to minimize waste. hint: look at formula subscripts.

Explanation:

Step1: Calculate cost of salicylic acid for 1000g aspirin

The cost of 500g salicylic acid is $16.45. To find the cost for 1000g, we first note that the scale - factor from 500g to 1000g is 2. So the cost of salicylic acid for 1000g aspirin is $\frac{16.45}{500}\times1000 = 32.9$.

Step2: Calculate cost of acetic anhydride for 1000g aspirin

The cost of 500mL acetic anhydride is $11.21. Assuming the same scale - up factor for volume as for mass (since we are scaling up the reaction), the cost of acetic anhydride for 1000g aspirin is $\frac{11.21}{500}\times1000=22.42$.

Step3: Calculate total cost

The total cost of raw materials to make 1000g aspirin is $32.9 + 22.42=55.32$.

Step4: Compare with supplier's price

The supplier sells 500g of aspirin powder for $31.60, so for 1000g, the supplier's price is $31.60\times2 = 63.20$. Since $55.32<63.20$, we can beat the supplier's price.

Answer:

a. The cost to make 1000 grams of aspirin is $55.32.
b. Yes, we can beat the supplier's price.
c. (No solution provided as it is an optional bonus and no reaction formula is given to calculate atom - economy)