core practical 5: oxidation of an alcohol Flashcards
(11 cards)
1
Q
partial oxidation of primary alcohols
A
- to aldehyde
- acidified potassium dichromate (sulphuric acid)
- simple ditilation apparatus
2
Q
difference between conditions for full oxidation and partial oxidation
A
full: excess oxidising agent and heat under reflux
partial: limited oxidising agent and distil
3
Q
why must the thermometer bulb in distillation be at the opening of the condenser
A
measure boiling temperature of vapous
4
Q
colour change
A
orange to green
cr2o7 2- to cr3+
5
Q
why anti bumping granules
A
- surface area for bubbles to form
- prevents large bubble from forming
6
Q
why not seal condesner in heat under reflux
A
build up of gas pressure could cause explosion
7
Q
fractional distillation separates
A
liquids with different boiling points
8
Q
what layer is at the top of separation funnel
A
- organic product; lower density
9
Q
how to get just the carboxylic acid at the end
A
distillation
10
Q
ethanol bp
A
78
11
Q
ethanal bp
A
20
