Question

Question #b447f

Answer 1

Synthesis of aspirin (acetylsalicylic acid) follows the reaction as represented by the above balanced equation.

As per above equation acetic anhydride and salicylic acid reacts in `1:1` mole ratio.

The amount of acetic anhydride in `6.8mL`

`=6.8mLxx1.08g/"mL"=7.344g`

Now by the equation

`102.09g` acetic anhydride reacts with `138.12g` salicylic acid.

So `7.344g` acetic anhydride requires `138.12/102.09xx7.344=9.936g` salicylic acid.

But the amount of salicylic acid actually taken is `3.395`.

So this is the limiting reagent.

We are to calculate the theoretical yield with respect to this reagent.

Now by the above equation we know that `138.12g` salicylic acid produces `180.157g` aspirin.

So `3.395g` salicylic acid will produce `180.157/138.12xx3.395=4.428g` aspirin.

So theoretical yield of aspirin `=4.428g`