[bulerz89]

So our teacher told us to research air pressure so we can find a way to make a balloon inflate and "coat" the inside of an erlenmyer flask.  So does anyone know how to do this besides using any way of heating?

[utramos]

 really any chemical reaction that releases enough gas could inflate a balloon heres and example..


 http://science.howstuffworks.com/framed.htm?parent=question57.htm&url=http://www.exploratorium.edu/science_explorer/bubblebomb.html

[bulerz89]

i guess i should have worded my question a little better.  We need the balloon to be "sucked" into the flask.

[xiankai]

just put the balloon into the flask and wrap the mouth of the balloon at the mouth of the flask, then add some reagents to create gas and cover the mouth of the balloon/flask.

[Yggdrasil]

Put the balloon over the mouth of a filtration flask, then connect the filtration flask to a vacuum line.  That will "inflate" the balloon.

[bulerz89]

the thing is that we can only use the standard lab equipment...such as forceps, bunsan burner (already know the heating method), clamps and such

[mike]

Heat the flask and attach the balloon, although I think this is what you mean by the heating method.

Some ammonia gas and a drop of water would work (but is too dangerous for benchtop chemistry)

Heat a samll amount of water in the flask to boiling then attach the balloon and then cool the water down with ice, analogous to the can crush experiment.

Light a candle (or anything really) inside the flask and attach the balloon, as the oxygen is consumed the pressure will decrease sucking the balloon in.

[lemonoman]

Light a candle (or anything really) inside the flask and attach the balloon, as the oxygen is consumed the pressure will decrease sucking the balloon in.

Isn't a gas produced by this reaction....so the effect is negligible?

If we're into chemical reactions...then you could always put in some ethene/ethylene and a tiny bit of chlorine...then set it out in the sun, and hope it doesn't explode because of heat.  It's a gas-phase polymerization that (should) produce polyethene or polyethylene - and probably a LOT of heat, so be careful lol

I suppose too...that if you had an insulated container...you could put the flask+balloon inside of it, and then some liquid nitrogen or dry ice outside the flask, but inside the container.  If the container is sealed, the stuff will evaporate and increase the pressure outside the flask...and compressing the balloon into it.  Probably not enough to 'coat the inside' as you speak of though.

[mike]

Isn't a gas produced by this reaction....so the effect is negligible?

Well this is how the banana in the bottle and the egg in the bottle work

If we're into chemical reactions...then you could always put in some ethene/ethylene and a tiny bit of chlorine...then set it out in the sun, and hope it doesn't explode because of heat.  It's a gas-phase polymerization that (should) produce polyethene or polyethylene - and probably a LOT of heat, so be careful lol

Probably even more dangerous than my first suggestion using ammonia.

I suppose too...that if you had an insulated container...you could put the flask+balloon inside of it, and then some liquid nitrogen or dry ice outside the flask, but inside the container.  If the container is sealed, the stuff will evaporate and increase the pressure outside the flask...and compressing the balloon into it.  Probably not enough to 'coat the inside' as you speak of though.

Never put dry ice or liquid nitrogen in a sealed container! If you are going to do this why not just use my suggestion of boiling water then placing in ice?

[lemonoman]

...Everything mike just said goes here

He's right.  Don't listen to me!

[Borek]

Light a candle (or anything really) inside the flask and attach the balloon, as the oxygen is consumed the pressure will decrease sucking the balloon in.

Isn't a gas produced by this reaction....so the effect is negligible?

I think it works only in the presence of water, as CO₂ easilly dissolves thus the gas volume drops.