Calomel

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  • Identifiers

    Molecular formula
    Cl2Hg2

    SMILES
    Cl[Hg].Cl[Hg]

    Safety labels

    Acute Toxic
    Acute Toxic

    Irritant
    Irritant

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Fishy 54.09%
    Odorless 44.31%
    Cheesy 42.41%
    Ripe 38.4%
    Alcoholic 32.99%
    Fermented 31.31%
    Oily 31.18%
    Pungent 23.22%
    Sweet 23.14%
    Solvent 22.28%

     

    Flavor
    Fishy 32.91%
    Egg 29.91%
    Odorless 28.24%
    Ammoniacal 26.39%
    Rotten 25.07%
    Decomposing cabbage 22.15%
    Sulfur 22.13%
    Garlic 21.43%
    Mousy 19.86%
    Ammonia 19.86%

     

  • Properties

    pKa est.
    -12.35 (strong acid)

    Molecular weight
    472.09 g/mol

    Flash point

    • 80.67 ˚C est.

  • Synonyms

    • MERCURY(I) CHLORIDE
    • Dimercury dichloride
    • Calogreen
    • Chlorure mercureux
    • Mercury subchloride
    • Mercury chloride (Hg2Cl2)
    • CCRIS 3803
    • Kalomel
    • ClHgHgCl
    • EINECS 233-307-5
    • UNII-J2D46N657D
    • (dimercury) dichloride
    • Hg2Cl2
    • MFCD00011043
    • CHEBI:33050
    • J2D46N657D
    • Calotab
    • Calomel [NF]
    • Mercurous chloride (Hg2Cl2)
    • cloruro mercurioso
    • dimercury(2+) chloride
    • mercury(1+);dichloride
    • SORE THROAT WITH PALLOR
    • DTXSID6044351
    • AKOS015904005
    • NS00076364
    • Mercury(I) chloride, ACS reagent, >=99.5%
    • Mercury(I) chloride, p.a., ACS reagent, 99.5%
    • Mercury(I) chloride, anhydrous, powder, 99.999% trace metals basis

  • Applications

    Calomel (CAS number: ) is used primarily as a reference electrode in electrochemical measurements, with calomel electrodes widely employed in laboratories and process-control settings; it also serves as a reagent or precursor for the preparation of organomercury compounds in specialized synthetic workflows; in analytical chemistry, it supports redox potential measurements and calibration of potentiometric instruments; it is occasionally used in educational settings to demonstrate mercurous chemistry and redox behavior in teaching laboratories.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 1256.88
    methanol 1476.23
    isopropanol 999.34
    water 95.07
    ethyl acetate 523.93
    n-propanol 829.26
    acetone 1284.69
    n-butanol 780.76
    acetonitrile 629.33
    DMF 2532.78
    toluene 384.38
    isobutanol 601.44
    1,4-dioxane 1404.52
    methyl acetate 563.66
    THF 2000.01
    2-butanone 708.09
    n-pentanol 612.84
    sec-butanol 681.93
    n-hexane 155.57
    ethylene glycol 708.23
    NMP 1636.18
    cyclohexane 248.17
    DMSO 2467.73
    n-butyl acetate 482.92
    n-octanol 461.55
    chloroform 1235.07
    n-propyl acetate 451.74
    acetic acid 1376.1
    dichloromethane 1085.77
    cyclohexanone 988.14
    propylene glycol 530.97
    isopropyl acetate 391.78
    DMAc 1461.25
    2-ethoxyethanol 1029.36
    isopentanol 597.82
    n-heptane 218.99
    ethyl formate 491.17
    1,2-dichloroethane 769.79
    n-hexanol 602.75
    2-methoxyethanol 1693.77
    isobutyl acetate 316.09
    tetrachloromethane 406.75
    n-pentyl acetate 445.13
    transcutol 1775.86
    n-heptanol 462.06
    ethylbenzene 218.53
    MIBK 461.85
    2-propoxyethanol 1021.43
    tert-butanol 1042.02
    MTBE 633.74
    2-butoxyethanol 768.05
    propionic acid 651.18
    o-xylene 333.01
    formic acid 765.61
    diethyl ether 726.63
    m-xylene 333.51
    p-xylene 279.75
    chlorobenzene 436.26
    dimethyl carbonate 405.07
    n-octane 104.67
    formamide 914.13
    cyclopentanone 1227.57
    2-pentanone 729.32
    anisole 496.19
    cyclopentyl methyl ether 900.74
    gamma-butyrolactone 1058.64
    1-methoxy-2-propanol 1220.24
    pyridine 953.98
    3-pentanone 516.4
    furfural 1107.41
    n-dodecane 86.27
    diethylene glycol 1135.73
    diisopropyl ether 307.17
    tert-amyl alcohol 698.79
    acetylacetone 765.79
    n-hexadecane 92.17
    acetophenone 469.36
    methyl propionate 524.28
    isopentyl acetate 392.35
    trichloroethylene 1140.97
    n-nonanol 401.87
    cyclohexanol 763.02
    benzyl alcohol 504.97
    2-ethylhexanol 373.32
    isooctanol 368.01
    dipropyl ether 543.87
    1,2-dichlorobenzene 411.14
    ethyl lactate 324.34
    propylene carbonate 583.28
    n-methylformamide 1005.85
    2-pentanol 608.18
    n-pentane 235.54
    1-propoxy-2-propanol 837.58
    1-methoxy-2-propyl acetate 534.19
    2-(2-methoxypropoxy) propanol 558.39
    mesitylene 251.74
    ε-caprolactone 733.14
    p-cymene 227.29
    epichlorohydrin 1067.45
    1,1,1-trichloroethane 723.55
    2-aminoethanol 823.46
    morpholine-4-carbaldehyde 1697.92
    sulfolane 1445.42
    2,2,4-trimethylpentane 115.74
    2-methyltetrahydrofuran 1106.94
    n-hexyl acetate 485.18
    isooctane 104.77
    2-(2-butoxyethoxy)ethanol 820.81
    sec-butyl acetate 320.34
    tert-butyl acetate 477.74
    decalin 114.03
    glycerin 846.4
    diglyme 1361.58
    acrylic acid 655.83
    isopropyl myristate 253.68
    n-butyric acid 759.9
    acetyl acetate 408.9
    di(2-ethylhexyl) phthalate 250.82
    ethyl propionate 354.02
    nitromethane 1346.17
    1,2-diethoxyethane 689.84
    benzonitrile 471.87
    trioctyl phosphate 220.44
    1-bromopropane 514.59
    gamma-valerolactone 1361.34
    n-decanol 319.25
    triethyl phosphate 241.17
    4-methyl-2-pentanol 372.08
    propionitrile 449.27
    vinylene carbonate 545.86
    1,1,2-trichlorotrifluoroethane 1075.54
    DMS 362.49
    cumene 190.5
    2-octanol 361.41
    2-hexanone 515.79
    octyl acetate 312.68
    limonene 338.87
    1,2-dimethoxyethane 1328.89
    ethyl orthosilicate 257.46
    tributyl phosphate 229.35
    diacetone alcohol 676.23
    N,N-dimethylaniline 491.66
    acrylonitrile 574.91
    aniline 572.72
    1,3-propanediol 953.22
    bromobenzene 396.93
    dibromomethane 815.26
    1,1,2,2-tetrachloroethane 984.74
    2-methyl-cyclohexyl acetate 319.76
    tetrabutyl urea 345.24
    diisobutyl methanol 301.29
    2-phenylethanol 459.91
    styrene 285.73
    dioctyl adipate 338.46
    dimethyl sulfate 644.85
    ethyl butyrate 398.97
    methyl lactate 472.81
    butyl lactate 391.65
    diethyl carbonate 274.79
    propanediol butyl ether 717.66
    triethyl orthoformate 345.89
    p-tert-butyltoluene 247.48
    methyl 4-tert-butylbenzoate 513.13
    morpholine 1552.34
    tert-butylamine 725.56
    n-dodecanol 270.55
    dimethoxymethane 1283.07
    ethylene carbonate 468.95
    cyrene 572.56
    2-ethoxyethyl acetate 512.17
    2-ethylhexyl acetate 342.91
    1,2,4-trichlorobenzene 503.79
    4-methylpyridine 818.71
    dibutyl ether 406.15
    2,6-dimethyl-4-heptanol 301.29
    DEF 932.73
    dimethyl isosorbide 816.94
    tetrachloroethylene 843.3
    eugenol 564.94
    triacetin 466.85
    span 80 604.29
    1,4-butanediol 520.04
    1,1-dichloroethane 722.62
    2-methyl-1-pentanol 467.91
    methyl formate 772.25
    2-methyl-1-butanol 549.26
    n-decane 125.63
    butyronitrile 506.4
    3,7-dimethyl-1-octanol 363.38
    1-chlorooctane 285.5
    1-chlorotetradecane 154.82
    n-nonane 128.63
    undecane 100.13
    tert-butylcyclohexane 118.15
    cyclooctane 112.69
    cyclopentanol 872.22
    tetrahydropyran 1120.61
    tert-amyl methyl ether 541.43
    2,5,8-trioxanonane 994.95
    1-hexene 333.85
    2-isopropoxyethanol 722.57
    2,2,2-trifluoroethanol 562.73
    methyl butyrate 468.92

    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