Hydrogen

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  • Identifiers

    CAS number
    1333-74-0

    Molecular formula
    H2

    SMILES
    [HH]

    Safety labels

    Flammable
    Flammable

    Compressed Gas
    Compressed Gas

  • Odor profile

  • Properties

    pKa est.
    17.2 (strong base)

    Molecular weight
    2.016 g/mol

    Melting point expt.

    • -434 °F (USCG, 1999)
    • -252.762 °C
    • -259.2 °C
    • -259 °C

    Boiling point

    • -423 °F at 760 mmHg (USCG, 1999)
    • -259.16 °C
    • -253 °C

    Flash point

    • -109.21 ˚C est.
    • Flammable gas

    Solubility expt.

    • In water, 1.62 mg/L at 21 °C
    • Soluble in about 50 volumes of water at 0 degC
    • Very low solubility in most liquids
    • 0.00162 mg/mL at 21 °C
    • Solubility in water, mg/l at 21 °C: 1.62 (very poor)

  • Synonyms

    • Hydrogen
    • Molecular hydrogen
    • Dihydrogen
    • 1333-74-0
    • Protium
    • hydrogen-1
    • DTXSID9029643
    • 7YNJ3PO35Z
    • CHEBI:18276
    • Hydrogen atoms
    • RefChem:389053
    • DTXCID00196437
    • 215-605-7
    • H
    • Atomic hydrogen
    • Hydrogen gas
    • H2
    • Hydrogen in Steel, 1g/piece
    • 1-Butanol, titanium(4+) salt, monohydrate, homopolymer (9CI)
    • Hydrogen, atomic
    • H in Stainless Steel, 1g Balls of O 6.35 mm
    • hidrogeno
    • hydrogene
    • Wasserstoff
    • o-Hydrogen
    • p-Hydrogen
    • hydrogen molecule
    • monoatomic hydrogen
    • 3A molecular sieve
    • HYDROGEN [HSDB]
    • alpha-Cellulose, 90mum
    • HYDROGEN [MI]
    • T101 Monoclonal Antibody
    • HYDROGEN [WHO-DD]
    • COware 20ml with H-Caps
    • Hydrogen in stainless steel
    • Hydrogen, >=99.99%
    • Hydrogen, >=99.999%
    • SCHEMBL29349524
    • SCHEMBL29357126
    • CHEBI:18140
    • CHEBI:33251
    • YZCKVEUIGOORGS-UHFFFAOYSA-N
    • BBL103822
    • NSC356464
    • STL557632
    • alpha-Cellulose, 25mum particle size
    • alpha-Cellulose, 65mum particle size
    • AKOS016038407
    • Hydrogen in Steel, 1g/ball, 20 pcs
    • NSC-356464
    • UN 1049
    • UN 1966
    • E949
    • Hydrogen, Messer(R) CANgas, 99.999%
    • E 949
    • E-949
    • NS00080750
    • C00282
    • alpha-Cellulose, Partical size: d50,180-280mum
    • alpha-Cellulose, Partical size: d50,90-150mum
    • H in Stainless Steel, 1g Stick of O 3.8x12 mm
    • H in Stainless Steel, 1g Stick of O 4.1x10 mm
    • Q3027893
    • Hydrogen in Aluminum, 10 rods 0.5" diameter x 24"
    • 1-Butanol,titanium(4+)salt,monohydrate,homopolymer(9ci)
    • 12184-90-6
    • 1H
    • H-H
    • 1333-74-0

  • Applications

    Hydrogen (CAS 1333-74-0) is used across multiple industrial applications: as a feed gas and reactant in ammonia synthesis for fertilizer production; as a reactive gas in refining processes and in hydrocracking and hydrotreating; participates in hydrogenation of hydrocarbons and fats/oils in petrochemical and food-processing contexts; as a reducing gas and in metallurgical processing to reduce metal oxides and provide reducing atmospheres; used in semiconductor technology for heating and surface cleaning/passivation processes; and serves as a fuel or energy carrier for fuel cells and clean-energy systems, subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 14.24
    methanol 16.23
    isopropanol 9.97
    water 0.13
    ethyl acetate 4.99
    n-propanol 11.32
    acetone 9.17
    n-butanol 9.87
    acetonitrile 8.92
    DMF 14.8
    toluene 1.5
    isobutanol 7.56
    1,4-dioxane 8.88
    methyl acetate 5.61
    THF 12.31
    2-butanone 6.7
    n-pentanol 5.77
    sec-butanol 8.32
    n-hexane 2.84
    ethylene glycol 6.1
    NMP 12.43
    cyclohexane 1.84
    DMSO 13.35
    n-butyl acetate 6.29
    n-octanol 4.5
    chloroform 11.09
    n-propyl acetate 3.13
    acetic acid 14.39
    dichloromethane 8.45
    cyclohexanone 8.51
    propylene glycol 7.58
    isopropyl acetate 2.85
    DMAc 8.08
    2-ethoxyethanol 5.43
    isopentanol 6.97
    n-heptane 2.07
    ethyl formate 3.99
    1,2-dichloroethane 5.0
    n-hexanol 10.23
    2-methoxyethanol 11.68
    isobutyl acetate 2.11
    tetrachloromethane 2.66
    n-pentyl acetate 2.92
    transcutol 14.82
    n-heptanol 4.31
    ethylbenzene 1.22
    MIBK 3.06
    2-propoxyethanol 9.77
    tert-butanol 10.58
    MTBE 6.09
    2-butoxyethanol 5.42
    propionic acid 9.71
    o-xylene 1.31
    formic acid 5.58
    diethyl ether 6.26
    m-xylene 1.24
    p-xylene 1.6
    chlorobenzene 2.81
    dimethyl carbonate 2.15
    n-octane 0.82
    formamide 5.43
    cyclopentanone 11.86
    2-pentanone 5.19
    anisole 2.76
    cyclopentyl methyl ether 5.66
    gamma-butyrolactone 12.92
    1-methoxy-2-propanol 8.71
    pyridine 5.87
    3-pentanone 3.99
    furfural 8.31
    n-dodecane 0.62
    diethylene glycol 7.57
    diisopropyl ether 1.95
    tert-amyl alcohol 8.31
    acetylacetone 4.34
    n-hexadecane 0.66
    acetophenone 2.53
    methyl propionate 4.57
    isopentyl acetate 5.02
    trichloroethylene 8.46
    n-nonanol 3.66
    cyclohexanol 6.15
    benzyl alcohol 2.51
    2-ethylhexanol 5.35
    isooctanol 3.19
    dipropyl ether 5.15
    1,2-dichlorobenzene 2.63
    ethyl lactate 2.34
    propylene carbonate 6.92
    n-methylformamide 8.2
    2-pentanol 6.33
    n-pentane 2.21
    1-propoxy-2-propanol 7.9
    1-methoxy-2-propyl acetate 4.2
    2-(2-methoxypropoxy) propanol 4.3
    mesitylene 0.98
    ε-caprolactone 6.75
    p-cymene 1.47
    epichlorohydrin 8.81
    1,1,1-trichloroethane 5.28
    2-aminoethanol 9.91
    morpholine-4-carbaldehyde 8.95
    sulfolane 14.57
    2,2,4-trimethylpentane 0.98
    2-methyltetrahydrofuran 9.63
    n-hexyl acetate 4.98
    isooctane 0.73
    2-(2-butoxyethoxy)ethanol 6.25
    sec-butyl acetate 2.05
    tert-butyl acetate 3.35
    decalin 0.92
    glycerin 8.22
    diglyme 8.61
    acrylic acid 9.13
    isopropyl myristate 2.13
    n-butyric acid 9.91
    acetyl acetate 3.05
    di(2-ethylhexyl) phthalate 2.04
    ethyl propionate 2.82
    nitromethane 12.05
    1,2-diethoxyethane 5.06
    benzonitrile 3.58
    trioctyl phosphate 1.81
    1-bromopropane 4.38
    gamma-valerolactone 10.42
    n-decanol 2.77
    triethyl phosphate 1.81
    4-methyl-2-pentanol 3.36
    propionitrile 6.97
    vinylene carbonate 5.45
    1,1,2-trichlorotrifluoroethane 7.52
    DMS 3.08
    cumene 1.11
    2-octanol 2.86
    2-hexanone 3.84
    octyl acetate 2.84
    limonene 2.56
    1,2-dimethoxyethane 7.53
    ethyl orthosilicate 1.81
    tributyl phosphate 2.12
    diacetone alcohol 5.15
    N,N-dimethylaniline 2.08
    acrylonitrile 8.13
    aniline 3.08
    1,3-propanediol 9.98
    bromobenzene 2.59
    dibromomethane 6.32
    1,1,2,2-tetrachloroethane 7.62
    2-methyl-cyclohexyl acetate 2.98
    tetrabutyl urea 2.69
    diisobutyl methanol 2.73
    2-phenylethanol 3.45
    styrene 1.53
    dioctyl adipate 2.8
    dimethyl sulfate 3.44
    ethyl butyrate 3.56
    methyl lactate 3.72
    butyl lactate 2.93
    diethyl carbonate 2.42
    propanediol butyl ether 5.61
    triethyl orthoformate 2.57
    p-tert-butyltoluene 1.55
    methyl 4-tert-butylbenzoate 3.28
    morpholine 11.01
    tert-butylamine 7.62
    n-dodecanol 2.19
    dimethoxymethane 5.63
    ethylene carbonate 4.52
    cyrene 3.37
    2-ethoxyethyl acetate 3.28
    2-ethylhexyl acetate 3.95
    1,2,4-trichlorobenzene 3.09
    4-methylpyridine 5.2
    dibutyl ether 4.25
    2,6-dimethyl-4-heptanol 2.73
    DEF 6.09
    dimethyl isosorbide 5.89
    tetrachloroethylene 5.34
    eugenol 3.44
    triacetin 3.56
    span 80 4.81
    1,4-butanediol 4.0
    1,1-dichloroethane 5.82
    2-methyl-1-pentanol 4.55
    methyl formate 5.16
    2-methyl-1-butanol 6.94
    n-decane 0.96
    butyronitrile 6.99
    3,7-dimethyl-1-octanol 3.82
    1-chlorooctane 2.6
    1-chlorotetradecane 1.14
    n-nonane 1.06
    undecane 0.75
    tert-butylcyclohexane 1.06
    cyclooctane 0.71
    cyclopentanol 8.33
    tetrahydropyran 8.76
    tert-amyl methyl ether 4.51
    2,5,8-trioxanonane 6.08
    1-hexene 5.25
    2-isopropoxyethanol 3.85
    2,2,2-trifluoroethanol 4.08
    methyl butyrate 3.97

    Scent© AI

1 4

IFRA standard 51

Recommendation
No restriction
Maximum acceptable concentrations in the finished product (%)
Category 1
Products applied to the lips
 No restriction Category 7A
Rinse-off products applied to the hair with some hand contact
 No restriction
Category 2
Products applied to the axillae
 No restriction Category 7B
Leave-on products applied to the hair with some hand contact
 No restriction
Category 3
Products applied to the face/body using fingertips
 No restriction Category 8
Products with significant anogenital exposure
 No restriction
Category 4
Products related to fine fragrance
 No restriction Category 9
Products with body and hand exposure, primarily rinse off
 No restriction
Category 5A
Body lotion products applied to the body using the hands (palms), primarily leave on
 No restriction Category 10A
Household care products with mostly hand contact
 No restriction
Category 5B
Face moisturizer products applied to the face using the hands (palms), primarily leave on
 No restriction Category 10B
Household care products with mostly hand contact, including aerosol/spray products (with potential leave-on skin contact)
 No restriction
Category 5C
Hand cream products applied to the hands using the hands (palms), primarily leave on
 No restriction Category 11A
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate without UV exposure
 No restriction
Category 5D
Baby Creams, baby Oils and baby talc
 No restriction Category 11B
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate with potential UV exposure
 No restriction
Category 6
Products with oral and lip exposure
 No restriction Category 12
Products not intended for direct skin contact, minimal or insignificant transfer to skin
 No restriction