Preparation of ethene

what kind of a reaction is this

dehydration/elimination

ethanol is dehydrated using what catalyst to produce ethene

hot aluminium oxide

aluminium oxide chemical formula

Al2O3

properties of ethanol

• burns with clean, clear flame

• follow by adding limewater and shake

Test for unsaturated bonds bromine water

turns from orange to colourless = unsaturated

test for unsaturated bonds acidified potassium permanganate (VII)(H2SO4)

turns from pink to colourless

aluminium oxide physical appearance

white powder

procedure for production of ethene

1. ethanol into boiling tube

2. glass wool to soak it up

3. set up apparatus

4. 2g of Al2O3

5. heat powder using bunsen

6. collect ethene by downward displacement of water

7. remove tubing before heat

why do we remove tubing before heat

to avoid suck back

why do we discard the first test tube

contains air

why do we avoid heating ethanol

• flammable

• will evaporate

aluminium oxide acts as the

dehydration agent and catalyst

glass wool precaution

irritant - use gloves

why can ethene we collected by the downward displacement of water

ethene is non-polar (not soluble in water)