Other
Experimental Lab report
- Course
- Institution
Coursework content
[Show more]
Seller
Follow
xfebin16
Content preview
CH382 Fundamental Laboratory Techniques CH382Technique 6: Separation by Distillation
Surname Xavier Grade
Initials FX Date: 29/10/19 Marker
Safety Data: For the experiment the following chemicals were used listed below are the
hazards:
Hexane – Flammable, environmental hazard, irritant, Health Hazard
Toluene – Flammable, Health hazard, Irritant
The experiment was conducted in a fume cupboard to avoid all risks, no ignition was
required at any stage.
, CH382 Fundamental Laboratory Techniques CH382
Method: For the experiment the liquid mixtures which consists of hexane and toluene
was supplied as a 1:1 mixture by volume of the two components assuming the starting
mixture to have a density of 0.76g ml-1 .
Within the apparatus a 250ml round bottom flask is used and never be more than two
thirds full of the liquid mixture, which also should be pre-charged with about 20ml of
toluene and some anti-bumping granules.
For the distillation transfer 60ml of the liquid mixture to the round bottomed flask using a
measuring cylinder, making sure the apparatus is secure and that all the QuickFit joints
are flush once the transfer is complete. Separate the mixture into two main fractions by
distillation about 20ml for each fraction and an additional intermediate fraction about
10ml. note the volumes of each distilled fraction collected using the graduated test tube.
Discard the first few millimetres of the distillate and thereafter start collecting the first
fraction which will be pure hexane. The thermometer holds a steady reading around the
boiling point of hexane which is set up for a liquid/vapour reflux around the bulb. The
second (intermediate) fraction will be a mixture of hexane and toluene which will distill
over a temperature range around 75 degrees celsius and the final fraction distilled will be
pure toluene. To avoid cracking the glassware do not boil to dryness, at least 5 – 10ml of
solvent should remain in the round bottomed flask.
Purity analysis (Abbe refractometer): the purity of the three distilled fractions can be
obtained by using an Abbe refractometer where the refractive index of each fraction can
be attained and used to compare it with literature values.
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 xfebin16. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.31. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
64438 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now