Core Practical 5 Flashcards
1
Q
What is the first step in the oxidation of ethanol to ethanal?
A
Add acidified potassium dichromate to a pear shaped flask +anti-bumping granules
2
Q
What is the point in adding anti-bumping granules?
A
prevent the formation of large gas bubbles that cause violent boiling
(smoother boiling)
3
Q
What are the colour changes for the reflux and the distillation of acidified dichromate and ethanol?
A
[For both reactions, the colour change occurs from orange (Cr2O72−) to green (Cr3+).]
4
Q
Why is heating under reflux used?
A
Prevents volatile reactants/products from escaping
Ensures even heating
5
Q
What type of heater do you use for reflux?
A
An electrical one/ water bath as naked flames can ignite the compounds
