Hydrogen iodide

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  • Identifiers

    CAS number
    10034-85-2

    Molecular formula
    HI

    SMILES
    I

    Safety labels

    Compressed Gas
    Compressed Gas

    Corrosive
    Corrosive

  • Odor profile

    Odor impact est.
    High

  • Properties

    XLogP3-AA
    0.9

    pKa est.
    -100.47 (strong acid)

    Molecular weight
    127.9124 g/mol

    Melting point expt.

    • -50.8 °C

    Boiling point

    • -35.1 °C at 760 mm Hg
    • Boiling point: -18.9 °C at 2 atm; 7.3 °C at 5 atm; 32.0 at 10 atm; 127.5 °C at 60 atm; decomposed by light; specific heat: 0.0545 cal/ g °C at 25 °C; forms an azeotrope with water /Hydrogen iodide/
    • -35.5 °C

    Flash point

    • 61.05 ˚C est.

    Solubility expt.

    • Extremely soluble in water; 234 g/100 g water at 10 °C; 900 g/100 g water at 0 °C
    • Solubility in water, g/100ml at 20 °C: 42 (freely soluble)

  • Synonyms

    • Hydriodic acid
    • HYDROGEN IODIDE
    • 10034-85-2
    • Hydroiodic acid
    • iodane
    • Hyriodic acid
    • Acido yodhidrico
    • Acide iodhydrique
    • Hydrogen iodide (HI)
    • Anhydrous hydriodic acid
    • Hydrogen iodide, anhydrous
    • Iodure d'hydrogene anhydre
    • Yoduro de hidrogeno anhidro
    • 694C0EFT9Q
    • CHEBI:43451
    • EPA Pesticide Chemical Code 046912
    • DTXSID2044349
    • RefChem:789094
    • DTXCID0024349
    • 233-109-9
    • Jodwasserstoff
    • Hydriotic acid
    • hydroiodide
    • MFCD00011347
    • HI
    • 53I
    • Iodine, isotope of mass 125
    • Caswell No. 482C
    • Acide iodhydrique [French]
    • Acido yodhidrico [Spanish]
    • UNII-694C0EFT9Q
    • Hydrogeniodid
    • Iodwasserstoff
    • Wasserstoffiodid
    • HSDB 2155
    • iodure d'hydrogene
    • EINECS 233-109-9
    • Iodure d'hydrogene anhydre [French]
    • organoiodine compound
    • UN1787
    • UN2197
    • organoiodine compounds
    • Yoduro de hidrogeno anhidro [Spanish]
    • IOHYDROIC ACID
    • SCHEMBL526
    • Epitope ID:117415
    • HYDRIODIC ACID [MI]
    • HYDROGEN IODIDE [MI]
    • UNII-GVO776611R
    • HYDRIODIC ACID [VANDF]
    • HYDROGEN IODIDE [HSDB]
    • SCHEMBL6344536
    • HYDRIODIC ACID [MART.]
    • HYDROGEN IODIDE [VANDF]
    • CHEMBL1233550
    • CHEBI:37142
    • BDBM50499191
    • AKOS015833254
    • AKOS015853961
    • Hydrogen Iodide (~55% w/w in H2O)
    • Hydriodic acid [UN1787] [Corrosive]
    • H1221
    • Q2462
    • Hydriodic acid, puriss. p.a., >=67% (T)
    • Hydriodic acid, purum p.a., 55-59% (T)
    • C05590
    • Hydriodic acid, JIS special grade, 55.0-58.0%
    • Hydroiodic acid, stabilised, 57% solution in water
    • Hydrogen iodide, anhydrous [UN2197] [Poison gas]
    • Hydriodic acid, contains No stabilizer, ACS reagent, 55%
    • Hydriodic acid, puriss. p.a., ACS reagent, >=47% (T)
    • Hydriodic acid, 57 wt. % in H2O, distilled, stabilized, 99.95%
    • Hydriodic acid, 57 wt. %, distilled, 99.999% trace metals basis
    • Hydriodic acid, contains <=1.5% hypophosphorous acid as stabilizer, ACS reagent, >=47.0%
    • Hydriodic acid, contains No stabilizer, distilled, 57 wt. % in H2O, 99.99% trace metals basis
    • I-H
    • 10034-85-2

  • Applications

    Hydrogen iodide (CAS 10034-85-2) is a strong hydrogen halide available as gas or solution and widely used as a reactive reagent and intermediate in organic synthesis: it converts alcohols to alkyl iodides, enables hydroiodination of alkenes and alkynes to give organoiodides that serve as substrates for cross-coupling reactions (e.g., Suzuki), cleaves acetals to reveal carbonyl compounds, and provides iodine-containing intermediates and reagents for pharmaceutical and specialty chemical manufacturing.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 426.92
    methanol 491.46
    isopropanol 310.6
    water 21.61
    ethyl acetate 204.25
    n-propanol 300.6
    acetone 484.77
    n-butanol 278.05
    acetonitrile 240.45
    DMF 777.66
    toluene 141.21
    isobutanol 209.73
    1,4-dioxane 510.04
    methyl acetate 226.51
    THF 687.56
    2-butanone 283.03
    n-pentanol 217.91
    sec-butanol 250.46
    n-hexane 39.06
    ethylene glycol 211.87
    NMP 675.66
    cyclohexane 60.34
    DMSO 806.83
    n-butyl acetate 196.83
    n-octanol 160.73
    chloroform 410.82
    n-propyl acetate 168.7
    acetic acid 493.52
    dichloromethane 349.69
    cyclohexanone 389.06
    propylene glycol 169.21
    isopropyl acetate 131.74
    DMAc 499.85
    2-ethoxyethanol 320.91
    isopentanol 206.56
    n-heptane 55.49
    ethyl formate 175.88
    1,2-dichloroethane 245.44
    n-hexanol 236.07
    2-methoxyethanol 500.43
    isobutyl acetate 116.56
    tetrachloromethane 120.21
    n-pentyl acetate 173.15
    transcutol 708.04
    n-heptanol 163.33
    ethylbenzene 72.45
    MIBK 149.97
    2-propoxyethanol 360.67
    tert-butanol 326.22
    MTBE 203.61
    2-butoxyethanol 269.47
    propionic acid 261.9
    o-xylene 106.49
    formic acid 240.59
    diethyl ether 246.55
    m-xylene 101.38
    p-xylene 96.88
    chlorobenzene 178.64
    dimethyl carbonate 124.55
    n-octane 25.46
    formamide 291.94
    cyclopentanone 491.33
    2-pentanone 256.07
    anisole 173.27
    cyclopentyl methyl ether 293.71
    gamma-butyrolactone 449.14
    1-methoxy-2-propanol 355.51
    pyridine 388.28
    3-pentanone 194.08
    furfural 451.59
    n-dodecane 24.62
    diethylene glycol 370.48
    diisopropyl ether 87.85
    tert-amyl alcohol 240.24
    acetylacetone 264.66
    n-hexadecane 26.84
    acetophenone 166.39
    methyl propionate 189.51
    isopentyl acetate 158.81
    trichloroethylene 404.47
    n-nonanol 135.92
    cyclohexanol 251.74
    benzyl alcohol 177.76
    2-ethylhexanol 141.12
    isooctanol 130.25
    dipropyl ether 171.99
    1,2-dichlorobenzene 155.41
    ethyl lactate 108.64
    propylene carbonate 239.37
    n-methylformamide 333.78
    2-pentanol 195.48
    n-pentane 54.36
    1-propoxy-2-propanol 278.8
    1-methoxy-2-propyl acetate 192.23
    2-(2-methoxypropoxy) propanol 221.6
    mesitylene 70.36
    ε-caprolactone 303.03
    p-cymene 74.35
    epichlorohydrin 391.37
    1,1,1-trichloroethane 236.76
    2-aminoethanol 266.36
    morpholine-4-carbaldehyde 578.69
    sulfolane 563.44
    2,2,4-trimethylpentane 30.98
    2-methyltetrahydrofuran 426.86
    n-hexyl acetate 193.31
    isooctane 25.79
    2-(2-butoxyethoxy)ethanol 306.61
    sec-butyl acetate 109.15
    tert-butyl acetate 152.49
    decalin 31.93
    glycerin 262.96
    diglyme 503.86
    acrylic acid 271.16
    isopropyl myristate 95.04
    n-butyric acid 289.55
    acetyl acetate 148.59
    di(2-ethylhexyl) phthalate 104.49
    ethyl propionate 128.56
    nitromethane 471.41
    1,2-diethoxyethane 258.14
    benzonitrile 197.27
    trioctyl phosphate 86.23
    1-bromopropane 173.88
    gamma-valerolactone 528.26
    n-decanol 109.0
    triethyl phosphate 82.38
    4-methyl-2-pentanol 118.29
    propionitrile 182.39
    vinylene carbonate 236.35
    1,1,2-trichlorotrifluoroethane 351.15
    DMS 143.16
    cumene 59.11
    2-octanol 124.62
    2-hexanone 197.49
    octyl acetate 122.35
    limonene 112.69
    1,2-dimethoxyethane 402.42
    ethyl orthosilicate 86.61
    tributyl phosphate 91.05
    diacetone alcohol 221.71
    N,N-dimethylaniline 146.18
    acrylonitrile 220.16
    aniline 209.7
    1,3-propanediol 304.54
    bromobenzene 162.83
    dibromomethane 266.01
    1,1,2,2-tetrachloroethane 321.04
    2-methyl-cyclohexyl acetate 119.27
    tetrabutyl urea 132.38
    diisobutyl methanol 96.61
    2-phenylethanol 185.06
    styrene 97.75
    dioctyl adipate 125.3
    dimethyl sulfate 209.08
    ethyl butyrate 139.44
    methyl lactate 150.82
    butyl lactate 150.3
    diethyl carbonate 94.93
    propanediol butyl ether 257.39
    triethyl orthoformate 116.43
    p-tert-butyltoluene 75.75
    methyl 4-tert-butylbenzoate 183.61
    morpholine 540.52
    tert-butylamine 218.34
    n-dodecanol 92.24
    dimethoxymethane 357.76
    ethylene carbonate 189.03
    cyrene 215.2
    2-ethoxyethyl acetate 214.15
    2-ethylhexyl acetate 140.66
    1,2,4-trichlorobenzene 197.58
    4-methylpyridine 339.96
    dibutyl ether 141.86
    2,6-dimethyl-4-heptanol 96.61
    DEF 299.61
    dimethyl isosorbide 306.63
    tetrachloroethylene 263.87
    eugenol 209.48
    triacetin 176.46
    span 80 234.96
    1,4-butanediol 165.58
    1,1-dichloroethane 239.26
    2-methyl-1-pentanol 173.23
    methyl formate 247.47
    2-methyl-1-butanol 199.13
    n-decane 33.71
    butyronitrile 192.87
    3,7-dimethyl-1-octanol 125.57
    1-chlorooctane 92.93
    1-chlorotetradecane 49.77
    n-nonane 33.04
    undecane 28.09
    tert-butylcyclohexane 34.25
    cyclooctane 23.89
    cyclopentanol 306.93
    tetrahydropyran 411.95
    tert-amyl methyl ether 170.27
    2,5,8-trioxanonane 378.36
    1-hexene 107.12
    2-isopropoxyethanol 234.4
    2,2,2-trifluoroethanol 193.01
    methyl butyrate 173.67

    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