hydrogen from h2o which metal for+ and - using sulphuric acid and 12 volts?
98419
I would use Carbon-Graphite electrodes for both the anode (+) and cathode (-) simply because they are cheap and effective.  The electrode you really need to be concerning yourself with is the anode since it is most prone to corrosion, you have much more freedom with the cathode.  I really dont see the need of using an expensive inert metal electrode, when graphite will do the job.
1126712
Yes, we've known about electrolysis for a long time.  It's how submarines make breathable air while submerged -- they electrolyze seawater and just bubble the hydrogen overboard while releasing oxygen gas into the boat.  However, it takes a lot of energy to convert water into hydrogen and oxygen, which isn't a concern in a small space with a nuclear reactor to power everything, but it isn't a 100% efficient conversion of electrical energy into chemical potential energy.  There is a loss of energy due to heat, for instance (the electrodes heat up with current passing through them, and even the wiring that carries it there), and as with any energy system, you have to take entropy into account.  Depending on who you talk to, you can get anywhere from 50% up to 94% efficiency, but you'll always put more energy into it than you get out of burning the hydrogen later on down the line.  The reason we're still researching fuel cell and hydrogen cars comes from the mechanical efficiency of the different types of engines -- you currently still get more bang for your buck out of fuels than from an electric motor-driven car.  The energy is only reusable if burning the hydrogen generates the electricity to separate the water back into hydrogen again, in which case, you're talking about a perpetual motion system, and that's physically impossible.
564023
acid + base ---> salt + H2O
560206
Production\n\nOn Earth, semiheavy water, HDO, occurs naturally in regular water at a proportion of about 1 molecule in 3200. This means that 1 in 6400 hydrogen atoms is deuterium (see VSMOW), which is 1 part in 3200 by weight (hydrogen weight). The HDO may be separated from regular water by distillation or electrolysis and also by various chemical exchange processes, all of which exploit a kinetic isotope effect. In short, the difference in mass between the two hydrogen isotopes translates into a difference in the zero-point energy and thus into a slight difference in the speed at which the reaction proceeds. Once HDO becomes a significant fraction of the water, heavy water will become more prevalent as water molecules trade hydrogen atoms very frequently. To produce pure heavy water by distillation or electrolysis requires a large cascade of stills or electrolysis chambers, and consumes large amounts of power, so the chemical methods are generally preferred. The most important chemical method is the Girdler Sulfide process.
1103908
you mean into a chloride?\neasy just add concentrated hydrochloric acid.the chloride will precipitate. and the sulfate will come out as hydrogen sulfide gas and water. maybe you need hydrogen to be passed in the mixture.\nna 2(so4)   + hcl  =      nacl   + h2s  + h2o
800284
a alkali will form a salt\na acid will not react\na metal will form a metalic sulphate and liberate hydrogen\n1)NAOH +H2SO4=NA2SO4+H20\n2)HCL +H2SO4=NO REACTION\n3)Zn+H2SO4=ZnSO4+H2
161405
The elements Hydrogen (H+) and Chlorine (Cl-) to make HCl (aka hydrochloric acid)
103404
Just how much Hydrogen do you want to produce?\nI could tell you several ways to make small amounts for next to no cost, but if you want to step up production, it will involve increase the price too.\n\nElectrolysis of water is probably the cheapest method, especially when the energy your using is cheap/free too.  The cheaper the energy, the cheaper the over all price.  The energy from a battery is much more expensive than the energy "out of the wall" which is much more expensive than energy from the sun (free).\n\nYou could also produce Hydrogen by reacting a more active metal in an acid.  Metals like Iron, Zinc, Magnesium, (you could use the Alkili metals, but I woulnt advise it), ...\nCopper (in a penny) wouldnt work since it is less active than Hydrogen, but the zinc inside the penny would. [we ignore the cost of the penny you have to destroy]
291231
H2O...two parts hydrogen and 1 part oxygen in each of the water molecules.
430141
I will make NaOH from the electrolysis of brine(saturated NaCl solution) using graphite anode and mercury cathode. On electrolysis, sodium will combine with mercury to form sodium amalgam(Na/Hg). Then make that sodium amalgam to combine with water(H20) so that we can get NaOH.
480571
H2S in solution is a weak acid and so will react to produce Water plus a sulphide salt with any strong base.
255642
In the case of metals what happens is that the protons "steal" the electrons of the metal to evolve a H2, or hydrogen gas, in doing so, the metal for example Fe, turns to Fe++ which will dissolve, if the acid used is HCL then you'll get as products H2  and Iron Chloride, if the acid is sulfuric, you'll get H2 and Iron Sulfate. This is completely electrochemical, whereas when an acid attacks  cement is just chemical, and what evolves is carbon dioxide, with skin, I'm not so sure.
88222
Water. Water contains two hydrogens and one oxygen. It's technical name should be dihydrogen monoxide, but we knew about water before chemistry was officially developed.
825689
CuCO3 + H2SO4 --> CuSO4 + CO2 + H2O\n\nCu(OH)2 + H2SO4 --> CuSO4 + 2H2O\n\nFor the electrolysis:\n\nCuSO4 = Cu+2 (aq) + (SO4)-2 (aq)\n\nCu+2 (aq) + 2 e-1 --> Cu (metal)
204256
The number always comes after the element, so two hydrogen and one oxygen.\n\neg if you have a more complex compound like Sulphuric Acid,\nH2SO4 that would be 2 hydrogen, one sulphur (or Sulfur in the USA) and 4 Oxygen
222974
Two hydrogen atoms, one oxygen atom.  H2O
1167923
water is generated by combining Hydrogen and Oxygen in a retort and applying eletrical spark.\nCoolant and pharmaceuticals labs