Summary
OCR A level chemistry aspirin practical summary notes
- Course
- Institution
summary in the form of questions on the left and answers on the right
[Show more]
Seller
Follow
rebeccamoore2
Content preview
ASPIRIN PRACTICALHow did we form aspirin? 1st practical Place a 250 cm3 beaker, half-filled with water, on top
of a tripod and gauze.
Clamp a 50 cm3 round-bottomed flask so that it is
partially submerged in the beaker of water, and fit a
reflux condenser to it vertically. Start to run water
through the condenser.
Add two anti-bumping granules to the flask. Then
weigh out 5.0 g of salicylic acid, 5.0 g of ethanoic
anhydride, and 5.0 g of phosphoric acid into separate
weighing bottles and add them, separately, into the
flask through a funnel placed on top of the condenser.
Heat the water in the beaker and reflux the mixture for
30 minutes. While this is happening, pour 150 cm3 of
distilled water into a 250 cm3 beaker and place it in an
ice bath.
How did we separate the aspirin from the solution? Allow the reaction mixture to cool down for a few
minutes, then dismantle the condenser and pour the
reaction mixture into the cold water. Stir for a few
minutes and allow the mixture to settle.
Filter the mixture through Buchner apparatus. Wash
any residue remaining in the beaker into the funnel
with more distilled water.
Remove the filter paper with the solid residue on it
and scrape it into another beaker.
How did we purify? Recrystallise the aspirin from the minimum quantity of
boiling water.
Give the word reaction for making aspirin Salicylic acid + ethanoic anhydride → aspirin +
ethanoic acid
Before carrying out TLC what did we do to aspirin so Dissolved in a drop or two of ethanol
could be used?
TLC what did we do with the plate? Use pencil to draw faint line 1cm above bottom of TLC
plate and mark 4 spots evenly placed along it
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller rebeccamoore2. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.91. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
81298 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now