Hydrogen
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Hydrogen
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CAS No:
1333-74-0
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Formula:
H2
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Chemical Name:
Hydrogen
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Synonyms:
Hydrogen;Orthohydrogen;Parahydrogen;Hydrogen (H2);Hydrogen molecule;Molecular hydrogen;Mol. hydrogen;Dihydrogen;Hydrogen gas;Hydrogen element;725200-57-7
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CAS No:
Description
Hydrogen,H2, is a tasteless,colorless, odorless gas that may be liquified by cooling under pressure. Hydrogen is used in welding, in the production of ammonia, methanol, and other chemicals, for the hydrogenation of oil and coal,and for the reduction of metallic oxide ores.It is obtained by the dissociation of water and as a by-product in the electrolysis of brine solutions. Molecular hydrogen at ambient temperature is relatively innocuous to most metals.However, atomic hydrogen is detrimental
Characteristics
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Hydrogen is a colorless, odorless gas. It is easily ignited. Once ignited it burns with a pale blue, almost invisible flame. The vapors are lighter than air. It is flammable over a wide range of vapor/air concentrations. Hydrogen is not toxic but is a simple asphyxiate by the displacement of oxygen in the air. Under prolonged exposure to fire or intense heat the containers may rupture violently and rocket. Hydrogen is used to make other chemicals and in oxyhydrogen welding and cutting.
0.07631 g/cm3
-259.2 °C
-252.77 °C
Flammable gas
1.98
H2O: 0.00017 g/100 mL
Keep container tightly closed in a dry and well-ventilated place. Contents under pressure. Storage class (TRGS 510): Gases
Vapour pressure, kPa at 25°C: 165320
0.07 (21 °C, vs air)
Only asphyxiating toxicity reviews
Flammable; water vapor is released in the fire
74.2%
Odorless
Tasteless
The pH of the supernatant liquid is between 5,0 and 7,5 (10 % suspension in water)
Safety Information
2.1
UN 1950 2.1
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12
9-16-33
MW8900000
F+
Treasury is ventilated, low temperature and dry; stored separately from oxidant
Explosive when mixed with air
Stable. Highly flammable. Readily forms explosive mixtures with air. Upper (U.K.) composition limit for use of a nitrogen/hydrogen mixture in the open lab is 5.7% hydrogen.
P210-P377-P381-P410 + P403
H220-H280
Hydrogen Use and Manufacturing
At present, industrial hydrogen production methods include the electrolysis water method, the sodium hydroxide by-product hydrogen production by electrolytic salt water production method, and the fossil fuel (natural gas, petroleum, etc.) conversion hydrogen production methods. Electrolysis of salt solution to produce caustic soda by-product method Electrolysis of salt (sodium chloride) solution produces chlorine gas on the anode and hydrogen gas on the cathode. After washing with water, compressed alkaline washing, freezing and drying, hydrogen with a purity of 99.8% is prepared. Its NaCl+H2O[Electrolysis]→0.5Cl2+0.5H2+NaOH anode reaction Cl-→0.5Cl2↑+e cathode reaction H2O+e→OH-+0.5H2↑water electrolysis method passes a certain voltage of direct current to a water electrolysis cell, The water decomposes. Oxygen is precipitated on the anode, and hydrogen is precipitated on the cathode. The hydrogen production method of fossil fuel conversion produces hydrogen from various fossil fuels-natural gas, petroleum and its products, and coal. The process is very similar. Its basic process is: steam conversion of hydrocarbons-including steam conversion of natural gas and light oil; partial oxidation-partial oxidation of crude oil, heavy oil and other liquid raw materials; gasification of coal.
In oxy-hydrogen blowpipe (welding) and limelight; autogenous welding of steel and other metals; manufacture of ammonia, synthetic methanol, HCl, NH3; hydrogenation of oils, fats, naphthalene, phenol; in balloons and airships; in metallurgy to reduce oxides to metals; in petroleum refining; in thermonuclear reactions (ionizes to form protons, deuterons (D) or tritons (T)).liquid hydrogen used in bubble chambers to study subatomic particles; as a coolant.
Computed Properties
Molecular Weight:2.016
Exact Mass:2.0156500638
Monoisotopic Mass:2.0156500638
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes
Price Analysis
Drug Function and Efficacy
Homeopathic preparation believed to influence oxidative processes and cellular respiration.
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