Rough Solutions for Exam

[sin0001]

Hey for the identification of whether the sample is pure or not, can you write that IR spec. can be used and the fingerprint region can be compared of the sample produced with a pure sample of propyl propanoate, on the spectra? Would this be a sufficient response for gaining the 2 marks?

[soccerboi]

With that identification of pure sample question, is HPLC acceptable?, and if not would i still at least get a mark for my explanation: run a HPLC chromatogram and if one spot appears, it's pure, if two or more spots appear it's not pure?

[vagrantshades]

With that identification of pure sample question, is HPLC acceptable?, and if not would i still at least get a mark for my explanation: run a HPLC chromatogram and if one spot appears, it's pure, if two or more spots appear it's not pure?

I thought HPLC produced a chromatogram with retention times and peaks not spots?

[soccerboi]

Oh crap... lol so would i still get a mark for the explanation? since it's a correct explanation for GC right? lol what was i thinking... i knew IR was the answer but thought that choosing HPLC would allow me to write a more concise response...

[sin0001]

apparently stuff like TLC and GC were the more appropriate answers

[nerfsdacier]

So hplc wouldn't be correct?

[monika.s]

For the first question of ahort answer where it asked for the monomer, I said beta-glucose instead of glucose. Is that still acceptable?

[HERculina]

What about using sodium carbonate and seeing if any bubbles (CO2) have appeared. But i wrote that this would indicate that their are some excess acidic reactants (propanoic acid AND propanol) still present so sample wouldn't be pure. But i don't think the alcohol actually reacts with sodium carbonate anymore. Will i get any marks at all :/
And yep ^ that would be accepted.

[AnThOnY47]

was it necessary to be so detailed in your response to the spectroscopic technique question. I chose AAS and simply said its interaction was that visible light is absorbed by atoms as it promotes electrons  to a higher energy level and that the amount of absorption indicated the concentration of the atoms present.

[Tonychet2]

was it necessary to be so detailed in your response to the spectroscopic technique question. I chose AAS and simply said its interaction was that visible light is absorbed by atoms as it promotes electrons  to a higher energy level and that the amount of absorption indicated the concentration of the atoms present.

that should be fine and wotrh 2 marks

[WhoTookMyUsername]

can HPLC be used to seperate propyl propanoate :S?

[thushan]

For the first question of ahort answer where it asked for the monomer, I said beta-glucose instead of glucose. Is that still acceptable?

It's more than acceptable, it's even better as an answer! Definitely get full marks for that.

[WhoTookMyUsername]

oh sh!! wrote O-H not oxygen and hydrogen

[AllAboutTheLGs]

wtf do you lose marks for writing O-H??

[Soul_Khan]

I wrote O-H and write next to it oxygen and hydrogen.. would that be right?