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a good way to capture hydrogen and oxygen from electrolysis? Answered

Well I've managed to actually seperate the hydrogen and oxygen from water, but I'm having alot of trouble capturing it. I want to capture the hydrogen and oxygen together, in one container. Anyone have any ideas?





haha iv done thing it was fun as exept i never used any saffty stuff... how ever you should ware that stuff... i did it in a 250ml bottle full and let it go for 5 minutes with 12v car battery... and gave it a spark (first time btw) it wasnt that bad it went about 4m high and wasnt to loud it was probs 2x louder that a cap gun. anyway but 2 holes that are a tight fit for the negative and positive wires to going to and another 1 that is 1cm wide and fit a peace of pipe 1cm wide into it. then another hole that is about a little smaller and put another longer pipe into that (WARNING LONGER THE BETTER!!! (i used garden hose) and it needs to be long enough so you aftre fare enough back so it dont explode in your face if it does... maybe 2m min and then put a balloon onto the small pipe that is where the gasses will go... then put the water in and the power hocked up and let it sit for 5min and then go to the end of the hose and blow the gasses into the balloon after that block the hose and go get the balloon ware stafty stuff when getting it... then you have got your gasses in the balloon for what ever you want.

I would advise against compressing both gasses together. Hydrogen alone can't burn. Oxygen alone doesn't react, but both together are potentially explosive.

Even compressing pure oxygen might be dangerous if there is any oil in the compressor. The diesel effect in a compressor can heat O2 + oil to ignition temps. Ignition is much easier in a pure O2 environment. Temp doesn't need to be as high to get fire with pure O2.

im looking for a way to collect it automatically. i want it to be pulled straight from that container and compressed in a propane tank. maybe even an actual air compressor. but make it so it only pulls in air from the container with hydrogen.

Fill a container with water, cover the top, invert it and then dip it into the water of your electrolysis kit.

The water will stay in the container.

Start the electrolysis, and the bubbles will rise into the container, displacing water.

When all the water is out of the container, put the lid on underwater, and remove.

Be very careful - the mixture of hydrogen and oxygen in the container will be highly explosive - wear eye protection, do not use a glass container, and keep away from sparks and flames.

thanks, I'll give that a shot. Also do you think the gas could be used as rocket fuel?

Oh, yes.

What do you think the shuttles ran on?

Plastic bottle, dose of the gas mixture, wave a match over the neck of the bottle and *bang*.

... there's an instructable on it somewhere.

To get hydrogen into a liquid requires either intense cold or intense pressure, neither of which are generally achievable at home.

If you want to make fuel for a DIY rocket try searching specifically for that. There are plenty of recipes for solid fuel cores or the fantastic Nitrous Oxide/Anything-with-fat-or-sugar (salami rockets and such).

If I have liquid nitrogen, will it be cold enough to liquify it?

It will liquefy the oxygen, but not the hydrogen.

Darn, so what would I need to liquify the hydrogen?


Note in particular the critical temperature, pressure, and boiling points.

Note ALSO the energy required to do the squeezing and cooling....

A specially-designed cryogenic system.


with not only very low temperatures but also very high pressures