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    Arghh. Have my first proper chem lab in 10 mins and to put it bluntly, my prelab work is ****.

    Bit late to tell all of you now, but hey.

    That is all.
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    Good luck then.
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    Haha. Lab was ace

    Demonstrator person helped me with the prelab and i got 8/10 for that and 12/12 for the lab its self.

    woot
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    Nice job! Just out of interest, what was it about?
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    extraction and purification of benzoic acid
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    Sounds fun our first lab was so boring! Titrations and my burette got blocked half way through so it was really annoying!
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    i'm doing another on tuesday. something to do with the synthesis of paracetamol. possibly :confused:
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    (Original post by NathanM)
    i'm doing another on tuesday. something to do with the synthesis of paracetamol. possibly :confused:
    Did something similar at school: the purification of parcetamol from Panadol pills.

    We took some Panadol pills and dissolved it in boiling water. Because paracetamol has a polar -OH group, it dissolves in the water, leaving insoluble impurities such as the (starch?) coating behind. We filtered the solution with a Buchner funnel and allowed the filtrate to cool slowly.

    Crystals of paracetamol formed and we washed it with ice cold solvent, which removes soluble impurities.

    Ta da!

    It was a lot of fun. You should have even more fun - the synthesis of paracetamol.
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    lol....totally. i'll let you know how fun it is tomorrow night =)
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    woo....made paracetamol today. twas fun
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    (Original post by NathanM)
    woo....made paracetamol today. twas fun
    How did you synthesise it?
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    To be perfectly honest, I don't know. :p:

    Quoting my lab book though:

    we mixed 4-aminophenol with acetic anhydride and triethylamine, heated the mixture (this hydrolised any unreacted anhydride and dissolved the product)

    then....we put the test tube containing the product in ice so that the required product could crystalise before collecting the crystals by vaccumn filtration

    we determined the melting point of the crystals.

    we then put the remaining crystals in a test tube along with ethanol, NaOH, heated it again, added HCl, and then cooled it again (making more crystals)

    another vacumn filtration, recorded the yield and then put the crystals (paracetamol now) in a jar to be examined and scrutinised by the lab staff :p:

    bit long winded, but...that's how I synthesised paracetamol

    Next week....Carboxylic acid and ester functional groups =|
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    (Original post by NathanM)
    To be perfectly honest, I don't know. :p:

    Quoting my lab book though:

    we mixed 4-aminophenol with acetic anhydride and triethylamine, heated the mixture (this hydrolised any unreacted anhydride and dissolved the product)

    then....we put the test tube containing the product in ice so that the required product could crystalise before collecting the crystals by vaccumn filtration

    we determined the melting point of the crystals.

    we then put the remaining crystals in a test tube along with ethanol, NaOH, heated it again, added HCl, and then cooled it again (making more crystals)

    another vacumn filtration, recorded the yield and then put the crystals (paracetamol now) in a jar to be examined and scrutinised by the lab staff :p:

    bit long winded, but...that's how I synthesised paracetamol

    Next week....Carboxylic acid and ester functional groups =|
    kl, sounds like fun!
 
 
 
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