Aspirin Sac

[blackmagic]

Hello people,
Got my aspirin sac on Monday, but I don't know what sort of questions to expect for it. We're allowed to take in a set of questions for the sac that includes a couple of general equations, structural formulas and yields. Could someone help a brother out??? cheers, peace out

[razmataz]

Questions such as. How do you test for purity. As well as why is a salt bonded with aspirin. And lastly the reaction pathways and the different ways of synthesising aspirin

[AngelWings]

I'd say all of the stuff Razmataz said and yield. Yield often comes up as a calculation.

[melbin123]

Questions such as. How do you test for purity. As well as why is a salt bonded with aspirin. And lastly the reaction pathways and the different ways of synthesising aspirin

So why does a salt bond with aspirin? Thanks a lot
Oh and also what kind of reaction pathways specifically?

[nhmn0301]

So why does a salt bond with aspirin? Thanks a lot
Oh and also what kind of reaction pathways specifically?

To increase the solubility of aspirin, you add NaOH, this will create COO-Na+ on the aspirin structure. Since this is ion-dipole bond, this is much stronger than the H-bond that aspirin can make to dissolve => increase solubility.
In terms of reaction pathway, they can ask you about why we prefer to use salicyclic acid + ethanoic anhydride to produce aspirin rather than salicyclic acid + ethanoic acid. The former reaction gives you water as an end product, water can dissolve aspirin, which reduce your yield, and drives the reaction backward.