Embedded Files
SAFETY: Alkene products are flammable, irritants, and/or health hazards if swallowed.
SAFETY: Allow the sand bath to cool before breaking down. Handle warm/hot equipment with hot mitts provided in the lab.
Do not move the apparatus to cool as the distillate could drop right back into the reaction flask!
Do not move the apparatus to cool as the distillate could drop right back into the reaction flask!
collection.mp4- Collect
Using a pipet, carefully transfer the distillate to a screw-cap vial
☢️ PRODUCT LOSS: 100 mg
Discussion: What happened to the product after this step / where is it?
SAFETY: Sodium sulfate is corrosive and an irritant.
drying.mp42. Dry
2. Dry
Add small microspatula-fulls of Na2SO4 at a time until the drying agent runs free in suspension (snow globe-style). Cap the vial and let the system sit for 5 minutes.
Anhydrous sodium sulfate absorbs trace amounts of water from the product.
Discuss:
What types of molecular interactions are present between water and sodium sulfate?
Why remove trace amounts of water from the sample (few reasons)?
isolation.mp4
ZOOM IN!
3. Filter
3. Filter
Filter product through a pipet with a loose cotton plug and collect the filtrate into a pre-weighed dry screw-cap vial.
<< the filter pipet!
Use a pipet with long stem to loosely pack a little bit of cotton into the top of another pipet
☢️ PRODUCT LOSS: 50 mg
Discuss: Why would using too much cotton negatively effect the experimental yield?
DETERMINE % YIELD
DETERMINE % YIELD
calculate the theoretical yield of product based on initial volume of methylcylohexanol added
report yield in mass (mg) and millimoles (mmol)
Keep track of product loss, given throughout the procedure this series of websites, and add them up to include a "total product loss" in your notebook
Remote lab: Calculate your 'actual yield' = (theoretical yield) - (total product loss)
Note: in the real lab, your actual yield would simply be the mass of liquid in the vial!
% yield of the synthesis (can use mg or mmol)
% yield of the synthesis (can use mg or mmol)
% yield = [(actual yield)/(theoretical yield)]x100%
Page updated
Report abuse