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Hydrogen

CAS No. 1333-74-0
Chemical Name: Hydrogen
Synonyms: H2;PROTIUM;HYDROGE;HYDROGEN;diprotium;Dihydrogen;p-Hydrogen;o-Hydrogen;hydrogengas;Wasserstoff
CBNumber: CB7686195
Molecular Formula: H2
Formula Weight: 2.02
MOL File: 1333-74-0.mol
Hydrogen Property
Melting point : −259.2 °C(lit.)
Boiling point : −252.8 °C(lit.)
density : 0.0899
vapor density : 0.07 (21 °C, vs air)
Fp : <-150°C
pka: 35(at 25℃)
explosive limit: 74.2%
Water Solubility : 0.00017 g/100 mL
Merck : 13,4813
Stability:: 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.
CAS DataBase Reference: 1333-74-0(CAS DataBase Reference)
NIST Chemistry Reference: Hydrogen(1333-74-0)
EPA Substance Registry System: Hydrogen(1333-74-0)
SAFETY
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes : F+
Risk Statements : 12
Safety Statements : 9-16-33
RIDADR : UN 1950 2.1
WGK Germany : -
RTECS : MW8900000
F : 4.5-31
HazardClass : 2.1
Hazardous Substances Data: 1333-74-0(Hazardous Substances Data)
Symbol(GHS):
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H220 Extremely flammable gas Flammable gases Category 1 Danger P210, P377, P381, P403
H280 Contains gas under pressure; may explode if heated Gases under pressure Compressed gas
Liquefied gas
Dissolved gas
Warning P410+P403
Precautionary statements:
P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P377 Leaking gas fire: Do not extinguish, unless leak can be stopped safely.
P381 Eliminate all ignition sources if safe to do so.
P410+P403 Protect from sunlight. Store in a well-ventilated place.

Hydrogen Chemical Properties,Usage,Production

Chemical Properties
colourless gas
Definition
ChEBI: An elemental molecule consisting of two hydrogens joined by a single bond.
General Description
Hydrogen is a colorless, odorless gas. Hydrogen is easily ignited. Once ignited Hydrogen burns with a pale blue, almost invisible flame. The vapors are lighter than air. Hydrogen 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.
Air & Water Reactions
Highly flammable.
Reactivity Profile
Finely divided platinum and some other metals will cause a mixture of Hydrogen and oxygen to explode at ordinary temperatures. If a jet of Hydrogen in air impinges on platinum black the metal surface gets hot enough to ignite the gases, [Mellor 1:325(1946-1947)]. Explosive reactions occur upon ignition of mixtures of nitrogen trifluoride with good reducing agents such as ammonia, Hydrogen, Hydrogen sulfide or methane. Mixtures of Hydrogen, carbon monoxide, or methane and oxygen difluoride are exploded when a spark is discharged, [Mellor 2, Supp. 1:192(1956)]. An explosion occurred upon heating 1'-pentol and 1''-pentol under Hydrogen pressure. Hydrogen appears that this acetylenic compound under certain conditions suddenly breaks down to form elemental carbon, Hydrogen, and carbon monoxide with the release of sufficient energy to develop pressures in excess of 1000 atmospheres, [AIChE Loss Prevention, p1, (1967)].
Health Hazard
Vapors may cause dizziness or asphyxiation without warning. Some may be irritating if inhaled at high concentrations. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire may produce irritating and/or toxic gases.
Fire Hazard
EXTREMELY FLAMMABLE. Will be easily ignited by heat, sparks or flames. Will form explosive mixtures with air. Vapors from liquefied gas are initially heavier than air and spread along ground. CAUTION: Hydrogen (UN1049), Deuterium (UN1957), Hydrogen, refrigerated liquid (UN1966) and Methane (UN1971) are lighter than air and will rise. Hydrogen and Deuterium fires are difficult to detect since they burn with an invisible flame. Use an alternate method of detection (thermal camera, broom handle, etc.) Vapors may travel to source of ignition and flash back. Cylinders exposed to fire may vent and release flammable gas through pressure relief devices. Containers may explode when heated. Ruptured cylinders may rocket.
Hydrogen Preparation Products And Raw materials
Raw materials
Petroleum crude oil HEAVY CUT RESIDUE OIL Potassium hydroxide Sodium chloride PETROLEUM ETHER Hydrochloric acid Methanol Sodium hydroxide Pentachlorophenol
Preparation Products
Cyclohexanecarboxylic acid DIMETHYL PHOSPHOROCHLORIDATE 2-Fluorophenol Isopentyl phenylacetate 3,5-DIAMINOPYRIDINE ETRIMFOS Methyl valeraldehyde Deoxynucleotide Triflumuron Zalcitabine 2,4-DICHLORO-5-ISOPROPOXYANILINE N-(1,3-Dimethylbutyl)-N'-phenyl-p-phenylenediamine 3-(3-METHYLPHENYL)PROPIONIC ACID Triethylaluminum 2-Chloro-5-hydroxymethylpyridine 4-tert-Butylbenzylamine 3-Dimethylaminopropylamine bomn,amorphous silicon nitride whisker Thiocarbohydrazide 2-(4-AMINOPHENYL)ETHYL AMINE 2HCL Hexamethyleneimine 5-Phenylvaleric acid Rosiglitazone Lithium hydride 3-(3-CHLOROPHENYL)PROPIONIC ACID 2-(Piperazin-1-yl)pyridin-3-amine 3-(4-METHYLPHENYL)PROPIONIC ACID Naproxen Prostaglandin E2 N-Isopropyl-N'-phenyl-1,4-phenylenediamine DL-Isoserine Molybdenum Vat Orange 11 Acetamiprid 3-(METHYLSULFONYL)ANILINE 2-Methyl-2-propanethiol PIPERAZINE-2-CARBOXYLIC ACID 4-Fluorophenol
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