chrmical equation for hydrogen
Following are some chemical equation in which hydrogen is formed:
1. Reactions with the release of hydrogen
At present, the most widespread method of obtaining hydrogen on an industrial scale is the conversion of methane CH₄ or natural gas. Methane is a natural gas, a simple hydrocarbon. When methane is heated with water vapors at high temperatures (1000 °С), hydrogen is released:
CH₄ + Н₂О→ C + 2H₂
2. Obtaining hydrogen with Kipp’s apparatus.
Kipp’s apparatus is the best-known device for obtaining gases, and consists of a flask, funnel and gas pipe. With this apparatus, hydrogen is obtained with zinc and hydrochloric and sulfuric acid. The apparatus makes it possible to collect gas in a test tube or other container, but experiments with the release of H₂ can also be carried out without it, simply by adding a piece of zinc and hydrochloric acid to a test tube:
Zn + 2HCl → ZnCl₂ + H₂↑
The reaction with the release of hydrogen from aluminum and alkali makes it possible to obtain purer hydrogen. This experiment can be carried out in the open air, by filling an ordinary balloon with hydrogen. It must not be carried out at home, as the experiment is potentially highly explosive.
2Al + 2NaOH + 6H₂O → 2Na[Al(OH)₄] + 3H₂↑
3. Reaction with the release of hydrogen using alkaline and alkaline earth metals and water.
Lithium is a light alkaline metal which does not sink in water. If you add a piece of lithium to lukewarm water, an immediate reaction with the release of gas will take place:
Li + H2O = LiOH + H₂↑
4. Reaction of the release of hydrogen using calcium and water
Calcium is a soft alkaline earth metal, and if you add purified metallic calcium to water, a violent reaction takes place with the release of hydrogen and calcium hydroxide:
Ca + 2H₂O → Ca(OH)₂↓ + H₂↑
5. Obtaining hydrogen by electrolysis
The simplest method to obtain hydrogen by electrolysis is the hydrolysis of water. This method can be used to obtain pure oxygen and hydrogen in the laboratory.
2Н₂О = 2Н₂↑ + О₂↑