how do you extract hydrogen?
80011
hydrolysis. the splitting of the water molecule. or just seperate the densities of the different components of air, then isolate the one that's the density of hydrogen and viola, you have pure hydrogen.
504628
you'll have a mixture of hydrogen and oxygen
199855
Electrolysis. Running a current through water will separate it into hydrogen and oxygen.
887688
If you could extract the hydrogen then you could. You'd also be a billionaire!
95444
Some tips...\n--Use a strong electrolyte (substances that will break up into ions [almost] completely in solution), the higher the concentration, the better.  Also you need to be careful on which electrolyte you choose.\n--Try not to use an over volttage (a voltage over the minimum necesary to electrolisize the water.  Insread, try to use a very high current, higher current = more production of gasses.  To increase current without increasing voltage, reduce resistance.\n--Place the electrodes close together to reduce internal resistance in the cell.\n\nEven by doing these things, you cannot hope to get much better than about 50% efficency doing water electrolysis, maybe 65% if you are good.\n\nThere are yahoo groups out there devoted to just such a tast as Hydrogen production through water electrolysis (I have one infact), they can also give advice based on experience.
312779
Separating the Hydrogen and the Oxygen from regular water is a simple grade school physic's experiment. I have included a link to a experiment page. Now whether it is illegal in Great Briton, I do not know. Now why we don't use it, you would have to ask the major car manufactures that question. The technology is not new, there has been powerful fuel cells floating in outer space for almost 4 decades. The problem with hydrogen as a fuel, is that if it expands uncontrollably you will have one big explosion on your hands.
476725
Drop Mg or Zn or something like that in HCl.  Or use electrolysis on water, but that's a lot harder.
585397
i built a simple one using seveal pairs of stainless steel knives and caning jars. It wasnt feasable for practical use, but it was a good demonstration of fuel cell theory. I used solution of water and baking soda. \nThe stainless steel knives were used because stainless steel contains nickle which is a catylyst for the full cell process. (platnuium is much better catylyst, but much more expensuve.) I combined the cells in seriese and ran a curent over them until bubles apear on the knives and then removed the current.\nNext i put a led light over the leads of the cells, and then it lit for about 5 seconds as it absorbed the hydrogen and converted it to electricity.\nIt operated similar to a capisitor in this setup.
61416
Yes you could. Free hydrogen (H2) is rare in the atmosphere though, so you would have to buy industrially obtained hydrogen (which mostly comes from natural gas) which is expensive so its always cheaper to drill a water well or something. But yes, if you want to combine oxygen and hydrogen, and light it with a match, you will get water. Good luck trying to contain it after it goes from gas to the combustion product of hydrogen and oxygen, which will be water vapor (steam).
561309
That is an excellent and timely question.  But the answer must have two parts when you say cheap, realisitic & practical method.  First, ou can split water (H2O) into hydrogen and oxygen (both having commercial value) by electrolysis using simple electrodes and an electric current.  But you must supply the energy.  If you use oil or gas that competes with the existing and growing demand for fuel and heating gas.  However, power can be supplied from coal (in expensive poluting power plants) or from solar energy.  Daystar is starting production of a flexible film photovoltaic solor cell that is expected to produce cheap electricity.  If almost all the roofs in the country were shingled with their product the hydrogen economy would be a cinch (and Daystar would be very happy!).  Secondly, there are also plans to design and construct huge nuclear power plants that operate so hot that they can directly dissociate water into hydrogen and oxygen.  The plants would be very expensive but the hydrogen (and oxygen) should be relatively cheap and no greenhouse gases would be produced.
311126
I'm not exactly sure what you're talking about, but yes, water can be separated into hydrogen gas (H2) and oxygen gas(O2). It's the following redox reaction.\n\nreduction: 2e- + 2H+ + H2O --> H2 + H2O\noxidation: 2H2O --> O2 + 4H+ + 4e-\n\nMultiply the reduction reaction by two and add the two together to get the final reaction.\n\n2H2O --> 2H2 + O2\n\nThe hydrogen goes down from a +1 state to a 0 state, and the oxygen goes up from a -2 state to a 0 state.
991620
http://video.google.com/videoplay?docid=-2134266654801392897\n\nmentos and diet soda, baking soda and vinegar.\n\nthough i'm wondering how the hell you're supposed to drop elemental hydrogen in water.  if you make it a solid that would be new and it wouldn't do anything...
686527
There are many ways to generate hydrogen outside electrolysis. Steam reforming, methane reforming, propane reforming, etc... Coastal countries may appear to have an advantage but you cannot have a fair comparison of supply and demand.  Consider the following:\n1. Many, many, many countries have access to coastal water, thus competition would be extremely fierce\n2. Countries will be more than self-sufficient and may "sell" excess product at a very low cost.\n3. Rivers, streams, rainwater etc... is available to more countries in the world than petroleum to many. \n \nI would not worry about it, depleting the sea is way way way way off, and besides, using H2 as fuel means that emission is....water. And no, the roads are not going to be slippery from algae (sorry, but I have heard a statement like that in the past)\n\nEver considered that we may come up with the technology to recover and re-use the water emission? Thus less filling up at your local Shell H2 station? \n\nI hope I was able to answer it for you in a objective manner
536199
follow the above.. to get gas.. electrolysis is the safest bet\n\nbut if you want to have fun???\n\nput some soap in the water and stir it around before you put the electrodes, this creates hydrogen bubbles that float and when put next to fire make a sweet pop sound.. do it safely, in a lab\n\nits a good demo for a highschool chem class
191415
The electrolysis of water with the o2 and h collected in seperate test tubes a lit match will ignite the hydrogen...POP! and a matchstick that has been blown out but still has a hot ember will burst into flame in the oxygen.
748528
as hydrogen is highly combustible it can be directly used to warm water\nand to generate electricity fusion reaction can be used which give enormous amount of heat
185385
Basically you need to oxidise ammonia and then  adsorb the gases into water.\n\nSee the site below.