Potassium mercuric iodide

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  • Identifiers

    CAS number
    7783-33-7

    Molecular formula
    HgI4K2

    SMILES
    [K+].[K+].I[Hg-2](I)(I)I

    Safety labels

    Acute Toxic
    Acute Toxic

    Health Hazard
    Health

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Odorless 81.97%
    Fishy 25.52%
    Ripe 17.89%
    Cheesy 16.18%
    Sulfurous 13.96%
    Meaty 13.86%
    Bitter 13.19%
    Animal 12.69%
    Savory 11.93%
    Musty 11.81%

     

  • Properties

    pKa est.
    -107.83 (strong acid)

    Molecular weight
    786.41 g/mol

    Flash point

    • -158.24 ˚C est.

    Solubility expt.

    • Very sol in water
    • Sol in alc, ether, acetone

  • Synonyms

    • 7783-33-7
    • Potassium mercuric iodide
    • Nessler's reagent
    • Mayer's reagent
    • Potassium tetraiodomercurate(II)
    • Nessler reagent
    • Caswell No. 695
    • Potassium iodomercurate
    • Dipotassium tetraiodomercurate
    • Mercury potassium iodide
    • Mercury(II) potassium iodide
    • MERCURIC POTASSIUM IODIDE
    • Potassium mercuriiodide
    • Potassium mercury iodine
    • Mercurate(2-), tetraiodo-, dipotassium, (T-4)-
    • Potassium tetraiodomercurate
    • Dipotassium tetraiodomercurate(2-)
    • Antistrumin
    • Mercuric potassium iodide, solid
    • HSDB 1243
    • Nesslers Reagenz
    • Potassium tetraiodomercurate (II)
    • Mercury potassium iodide (K2HgI4)
    • EINECS 231-990-4
    • UN1643
    • reactivo de Nessler
    • EPA Pesticide Chemical Code 052107
    • Mercurate(2-), tetraiodo-, dipotassium
    • Potassium mercuric iodide [NF]
    • dipotassium;tetraiodomercury(2-)
    • Kaliumtetraiodomercurat(II)
    • potassium tetraiodidomercurate
    • K2[HgI4]
    • Mercurate (2-), tetraiodo-, dipotassium
    • 7N83S6IU0F
    • CHEBI:51568
    • DTXSID30893684
    • potassium tetraiodidomercurate(II)
    • potassium tetraiodidomercurate(2-)
    • Mercurate(2-), tetraiodo-, dipotassium, (beta-4)-
    • K2(HgI4)
    • Mercurate(2-), tetraiodo-, potassium (1:2), (T-4)-
    • UNII-7N83S6IU0F
    • MFCD00049656
    • Mercury(2+) potassium iodide
    • dipotassium tetraiodomercurydiuide
    • Dipotassium tetraiodomercurate(2)
    • OPCMAZHMYZRPID-UHFFFAOYSA-J
    • DTXCID101323715
    • Mercurate(2), tetraiodo, dipotassium
    • AKOS015902445
    • NS00080702
    • Mercury(II) chloride-potassium iodide solution
    • Mercury potassium iodide [UN1643] [Poison]
    • Q416649
    • Potassium tetraiodomercurate-potassium hydroxide solution
    • 231-990-4

  • Applications

    Potassium mercuric iodide (CAS 7783-33-7) is primarily used as a specialty inorganic reagent and synthesis intermediate in laboratory and industrial research settings. In analytical chemistry, it can function as a source of Hg2+ and iodide for qualitative and quantitative studies and for generating mercury-iodide–containing complexes. In inorganic synthesis and coordination chemistry, it serves as a starting material for preparing mercury-iodide salts and related coordination compounds. In materials science, it is employed as a precursor for crystal growth experiments and for investigations into the structural properties of mercury-iodide systems. Its use is confined to controlled laboratory environments, with handling and waste disposal governed by relevant safety and regulatory requirements.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 89.08
    methanol 99.5
    isopropanol 55.58
    water 3.04
    ethyl acetate 46.36
    n-propanol 60.59
    acetone 90.06
    n-butanol 52.55
    acetonitrile 56.95
    DMF 147.3
    toluene 21.12
    isobutanol 40.47
    1,4-dioxane 97.08
    methyl acetate 53.29
    THF 118.53
    2-butanone 60.67
    n-pentanol 41.59
    sec-butanol 45.88
    n-hexane 8.55
    ethylene glycol 48.04
    NMP 143.09
    cyclohexane 9.63
    DMSO 149.5
    n-butyl acetate 43.35
    n-octanol 33.56
    chloroform 74.09
    n-propyl acetate 35.55
    acetic acid 95.65
    dichloromethane 59.3
    cyclohexanone 84.35
    propylene glycol 39.36
    isopropyl acetate 28.72
    DMAc 89.33
    2-ethoxyethanol 56.73
    isopentanol 39.63
    n-heptane 9.77
    ethyl formate 34.2
    1,2-dichloroethane 46.78
    n-hexanol 53.06
    2-methoxyethanol 94.21
    isobutyl acetate 24.27
    tetrachloromethane 18.91
    n-pentyl acetate 32.78
    transcutol 159.58
    n-heptanol 33.4
    ethylbenzene 12.88
    MIBK 33.45
    2-propoxyethanol 76.94
    tert-butanol 58.08
    MTBE 40.12
    2-butoxyethanol 51.01
    propionic acid 65.47
    o-xylene 17.48
    formic acid 44.63
    diethyl ether 48.62
    m-xylene 17.47
    p-xylene 16.98
    chlorobenzene 33.15
    dimethyl carbonate 27.22
    n-octane 4.47
    formamide 55.74
    cyclopentanone 118.8
    2-pentanone 52.69
    anisole 33.6
    cyclopentyl methyl ether 58.28
    gamma-butyrolactone 116.06
    1-methoxy-2-propanol 72.3
    pyridine 64.18
    3-pentanone 40.51
    furfural 92.83
    n-dodecane 4.28
    diethylene glycol 74.53
    diisopropyl ether 17.65
    tert-amyl alcohol 46.75
    acetylacetone 54.7
    n-hexadecane 4.59
    acetophenone 34.59
    methyl propionate 42.97
    isopentyl acetate 36.87
    trichloroethylene 79.16
    n-nonanol 27.76
    cyclohexanol 45.39
    benzyl alcohol 30.79
    2-ethylhexanol 32.12
    isooctanol 25.45
    dipropyl ether 33.28
    1,2-dichlorobenzene 33.17
    ethyl lactate 23.38
    propylene carbonate 60.55
    n-methylformamide 68.12
    2-pentanol 38.44
    n-pentane 9.72
    1-propoxy-2-propanol 55.81
    1-methoxy-2-propyl acetate 43.31
    2-(2-methoxypropoxy) propanol 45.13
    mesitylene 13.13
    ε-caprolactone 68.11
    p-cymene 14.6
    epichlorohydrin 79.24
    1,1,1-trichloroethane 42.99
    2-aminoethanol 58.59
    morpholine-4-carbaldehyde 114.15
    sulfolane 128.03
    2,2,4-trimethylpentane 5.33
    2-methyltetrahydrofuran 80.13
    n-hexyl acetate 43.32
    isooctane 4.47
    2-(2-butoxyethoxy)ethanol 63.65
    sec-butyl acetate 22.83
    tert-butyl acetate 34.93
    decalin 6.14
    glycerin 58.09
    diglyme 99.33
    acrylic acid 65.97
    isopropyl myristate 19.62
    n-butyric acid 58.83
    acetyl acetate 33.42
    di(2-ethylhexyl) phthalate 20.33
    ethyl propionate 28.94
    nitromethane 109.85
    1,2-diethoxyethane 51.77
    benzonitrile 38.6
    trioctyl phosphate 17.53
    1-bromopropane 31.38
    gamma-valerolactone 112.5
    n-decanol 22.06
    triethyl phosphate 19.02
    4-methyl-2-pentanol 23.48
    propionitrile 41.68
    vinylene carbonate 54.19
    1,1,2-trichlorotrifluoroethane 68.5
    DMS 33.99
    cumene 11.42
    2-octanol 24.2
    2-hexanone 40.65
    octyl acetate 25.52
    limonene 22.95
    1,2-dimethoxyethane 70.21
    ethyl orthosilicate 18.87
    tributyl phosphate 19.63
    diacetone alcohol 51.94
    N,N-dimethylaniline 26.42
    acrylonitrile 53.61
    aniline 33.95
    1,3-propanediol 63.87
    bromobenzene 29.16
    dibromomethane 44.82
    1,1,2,2-tetrachloroethane 63.2
    2-methyl-cyclohexyl acetate 27.05
    tetrabutyl urea 27.53
    diisobutyl methanol 20.72
    2-phenylethanol 35.41
    styrene 17.03
    dioctyl adipate 25.92
    dimethyl sulfate 43.34
    ethyl butyrate 29.91
    methyl lactate 34.52
    butyl lactate 29.61
    diethyl carbonate 21.21
    propanediol butyl ether 51.61
    triethyl orthoformate 23.45
    p-tert-butyltoluene 14.82
    methyl 4-tert-butylbenzoate 37.16
    morpholine 98.15
    tert-butylamine 39.84
    n-dodecanol 17.83
    dimethoxymethane 66.47
    ethylene carbonate 42.53
    cyrene 44.84
    2-ethoxyethyl acetate 43.56
    2-ethylhexyl acetate 31.77
    1,2,4-trichlorobenzene 40.1
    4-methylpyridine 54.61
    dibutyl ether 28.52
    2,6-dimethyl-4-heptanol 20.72
    DEF 60.34
    dimethyl isosorbide 65.46
    tetrachloroethylene 48.45
    eugenol 41.39
    triacetin 41.09
    span 80 43.68
    1,4-butanediol 31.25
    1,1-dichloroethane 43.45
    2-methyl-1-pentanol 34.55
    methyl formate 50.76
    2-methyl-1-butanol 38.39
    n-decane 6.31
    butyronitrile 39.18
    3,7-dimethyl-1-octanol 27.19
    1-chlorooctane 19.9
    1-chlorotetradecane 9.36
    n-nonane 6.23
    undecane 5.04
    tert-butylcyclohexane 6.72
    cyclooctane 4.26
    cyclopentanol 58.09
    tetrahydropyran 74.92
    tert-amyl methyl ether 34.93
    2,5,8-trioxanonane 75.72
    1-hexene 22.44
    2-isopropoxyethanol 42.01
    2,2,2-trifluoroethanol 39.02
    methyl butyrate 38.64

    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