I really need help on this today, or at the latest, I need it by 12pm Tuesday 23rd. So I'd really appreciate if anyone could help and + rep to anyone who does, as a little thank you
I have an experiment on Aspirin synthesis, and I really need help with 2 questions.
1) Calculate the the percentage yield (based on moles) of crude aspirin.
Information I am given: Molar mass of salicylic acid = 138 Molar mass of asprin = 180
I know how to calculate percentage yield. My question is what percentage should I be expecting, roughly?
2) Describe Aspirin (after crystalisation)
What should I expect it to look like? i.e what is the mark scheme likely to be looking for.
Edit: Also, if anyone can link to a mark scheme for a practical on Aspirin synthesis I would be eternally grateful, thanks.
Oh, you just said you used a Buchner Funnel which isn't very descriptive!! If you did a recryst then you should have some nice shiny white crystals. However a recryst can do horrible things to your yield so could be anything from 50% upwards really.
If you did a recryst then you should have some nice shiny white crystals. However a recryst can do horrible things to your yield so could be anything from 50% upwards really.
it could depend on a whole lot of things, just write up your results as you found them. embelishing can result in v serious consiquences. if this is an UG course you can fail for making data up.
it could depend on a whole lot of things, just write up your results as you found them. embelishing can result in v serious consiquences. if this is an UG course you can fail for making data up.
I plan to. However, I wouldn't have used the words "crystaline solid" had I not made this thread. That was my purpose. To get the terminology right
your percentage yield may be over 100% due to excess water... also the aspirin should be white crystals. Probaly have some unreacted Salicylic acid in there too so if youve dried it properly maybe about 70% yield