Cobalt chloride (cocl2)

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  • Identifiers

    CAS number
    7646-79-9

    Molecular formula
    Cl2Co

    SMILES
    [Cl-].[Cl-].[Co+2]

    Safety labels

    Irritant
    Irritant

    Health Hazard
    Health

    Environmental Hazard
    Environmental

  • Odor profile

    Odor impact est.
    High

  • Properties

    pKa est.
    -20.07 (strong acid)

    Molecular weight
    129.84 g/mol

    Melting point expt.

    • 187 °F (USCG, 1999)
    • 735 °C

    Boiling point

    • 1049 °C

    Flash point

    • -44.85 ˚C est.

    Solubility expt.

    • Soluble in water
    • 53.420 lb/100 lb water at 70 °F
    • In water, 1.16 kg/L at 0 °C
    • Soluble in alcohols, acetone, ether, glycerol, and pyridine
    • For more Solubility (Complete) data for Cobaltous chloride (6 total), please visit the HSDB record page.

  • Synonyms

    • COBALTOUS CHLORIDE
    • Cobalt muriate
    • Cobaltous dichloride
    • Cobaltous chloride anhydrous
    • Kobalt chlorid
    • Cobalt(2+) chloride
    • Cobaltum muriaticum
    • EVS87XF13W
    • CHEBI:35696
    • Cobalt dichloride (cocl2)
    • NSC-51149
    • CoCl(2)
    • RefChem:54867
    • lambda2-cobalt(2+) ion dichloride
    • Technetium Tc-99m Exametazime and Cobaltous Chloride
    • 231-589-4
    • 7646-79-9
    • Cobalt chloride (cocl2)
    • Cobalt dichloride
    • Cobalt(II)chloride
    • COCl2
    • Dichlorocobalt
    • Cobalt chloride
    • 1332-82-7
    • cobalt(2+);dichloride
    • cobalt(2+) dichloride
    • Kobaltdichlorid
    • Kobalt(II)-chlorid
    • Cobalt(II) chloride anhydrous
    • Kobalt chlorid (German)
    • CCRIS 4224
    • DTXSID9040180
    • HSDB 1000
    • EINECS 231-589-4
    • NSC 51149
    • Epitope ID:115003
    • UNII-EVS87XF13W
    • SCHEMBL15588
    • COBALTOUS CHLORIDE [MI]
    • COBALT CHLORIDE [MART.]
    • COBALT CHLORIDE [WHO-DD]
    • COBALTOUS CHLORIDE [HSDB]
    • COBALTUM MURIATICUM [HPUS]
    • DB14206
    • C2388
    • NS00076458
    • EC 231-589-4
    • F494379
    • 7646-79-9

  • Applications

    Cobalt chloride (cocl2), CAS 7646-79-9, is used primarily as a humidity indicator and moisture-sensing material in packaging, coatings, and electronics, where its color change with hydration provides a simple moisture signal; it also serves as a cobalt source for catalysts and chemical synthesis in industrial manufacturing; in laboratories it is used as a reagent for moisture and water-content determinations; in agriculture it can function as a trace cobalt supplement in specialized fertilizer formulations; and in research and education environments it is routinely used in colorimetric demonstrations of hydration and dehydration.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 126.91
    methanol 165.49
    isopropanol 93.9
    water 6.11
    ethyl acetate 75.96
    n-propanol 86.86
    acetone 177.89
    n-butanol 80.29
    acetonitrile 122.36
    DMF 339.09
    toluene 43.06
    isobutanol 64.69
    1,4-dioxane 189.21
    methyl acetate 97.64
    THF 197.43
    2-butanone 102.71
    n-pentanol 58.51
    sec-butanol 78.21
    n-hexane 14.85
    ethylene glycol 68.61
    NMP 262.11
    cyclohexane 23.07
    DMSO 306.49
    n-butyl acetate 59.72
    n-octanol 47.83
    chloroform 111.35
    n-propyl acetate 51.89
    acetic acid 150.52
    dichloromethane 102.9
    cyclohexanone 120.08
    propylene glycol 48.34
    isopropyl acetate 47.45
    DMAc 241.68
    2-ethoxyethanol 105.58
    isopentanol 65.55
    n-heptane 15.44
    ethyl formate 58.19
    1,2-dichloroethane 77.65
    n-hexanol 63.29
    2-methoxyethanol 176.9
    isobutyl acetate 34.06
    tetrachloromethane 34.3
    n-pentyl acetate 45.34
    transcutol 289.63
    n-heptanol 37.31
    ethylbenzene 24.77
    MIBK 54.14
    2-propoxyethanol 109.36
    tert-butanol 121.16
    MTBE 87.82
    2-butoxyethanol 71.0
    propionic acid 83.46
    o-xylene 38.52
    formic acid 69.37
    diethyl ether 92.52
    m-xylene 32.98
    p-xylene 35.51
    chlorobenzene 56.96
    dimethyl carbonate 52.99
    n-octane 8.06
    formamide 94.08
    cyclopentanone 149.38
    2-pentanone 84.62
    anisole 66.38
    cyclopentyl methyl ether 90.92
    gamma-butyrolactone 154.33
    1-methoxy-2-propanol 123.6
    pyridine 108.23
    3-pentanone 69.45
    furfural 142.28
    n-dodecane 8.24
    diethylene glycol 116.3
    diisopropyl ether 33.22
    tert-amyl alcohol 88.8
    acetylacetone 102.52
    n-hexadecane 9.05
    acetophenone 61.56
    methyl propionate 73.34
    isopentyl acetate 53.64
    trichloroethylene 127.29
    n-nonanol 40.78
    cyclohexanol 72.72
    benzyl alcohol 52.35
    2-ethylhexanol 40.94
    isooctanol 30.56
    dipropyl ether 48.43
    1,2-dichlorobenzene 55.66
    ethyl lactate 34.14
    propylene carbonate 77.7
    n-methylformamide 119.89
    2-pentanol 58.45
    n-pentane 19.08
    1-propoxy-2-propanol 79.01
    1-methoxy-2-propyl acetate 62.76
    2-(2-methoxypropoxy) propanol 80.93
    mesitylene 26.4
    ε-caprolactone 95.95
    p-cymene 23.95
    epichlorohydrin 126.73
    1,1,1-trichloroethane 81.8
    2-aminoethanol 76.42
    morpholine-4-carbaldehyde 224.25
    sulfolane 191.19
    2,2,4-trimethylpentane 12.78
    2-methyltetrahydrofuran 131.49
    n-hexyl acetate 65.37
    isooctane 9.69
    2-(2-butoxyethoxy)ethanol 104.73
    sec-butyl acetate 35.96
    tert-butyl acetate 58.82
    decalin 12.84
    glycerin 82.25
    diglyme 189.01
    acrylic acid 90.32
    isopropyl myristate 31.1
    n-butyric acid 78.2
    acetyl acetate 58.19
    di(2-ethylhexyl) phthalate 31.82
    ethyl propionate 46.47
    nitromethane 209.4
    1,2-diethoxyethane 91.54
    benzonitrile 64.17
    trioctyl phosphate 24.64
    1-bromopropane 51.63
    gamma-valerolactone 165.81
    n-decanol 32.3
    triethyl phosphate 29.52
    4-methyl-2-pentanol 35.86
    propionitrile 70.8
    vinylene carbonate 71.45
    1,1,2-trichlorotrifluoroethane 113.84
    DMS 61.24
    cumene 20.58
    2-octanol 30.27
    2-hexanone 59.66
    octyl acetate 39.44
    limonene 36.68
    1,2-dimethoxyethane 170.0
    ethyl orthosilicate 29.55
    tributyl phosphate 29.49
    diacetone alcohol 80.77
    N,N-dimethylaniline 56.01
    acrylonitrile 88.29
    aniline 55.86
    1,3-propanediol 94.92
    bromobenzene 56.21
    dibromomethane 75.13
    1,1,2,2-tetrachloroethane 99.55
    2-methyl-cyclohexyl acetate 39.39
    tetrabutyl urea 43.36
    diisobutyl methanol 29.31
    2-phenylethanol 53.55
    styrene 33.71
    dioctyl adipate 42.61
    dimethyl sulfate 93.02
    ethyl butyrate 45.18
    methyl lactate 55.29
    butyl lactate 40.21
    diethyl carbonate 34.99
    propanediol butyl ether 76.51
    triethyl orthoformate 37.25
    p-tert-butyltoluene 25.18
    methyl 4-tert-butylbenzoate 61.98
    morpholine 179.87
    tert-butylamine 74.6
    n-dodecanol 27.19
    dimethoxymethane 155.44
    ethylene carbonate 58.63
    cyrene 69.92
    2-ethoxyethyl acetate 68.08
    2-ethylhexyl acetate 44.11
    1,2,4-trichlorobenzene 68.06
    4-methylpyridine 101.4
    dibutyl ether 50.57
    2,6-dimethyl-4-heptanol 29.31
    DEF 127.27
    dimethyl isosorbide 110.1
    tetrachloroethylene 79.81
    eugenol 68.18
    triacetin 68.32
    span 80 70.68
    1,4-butanediol 46.32
    1,1-dichloroethane 75.49
    2-methyl-1-pentanol 50.14
    methyl formate 96.31
    2-methyl-1-butanol 62.59
    n-decane 11.36
    butyronitrile 65.51
    3,7-dimethyl-1-octanol 42.64
    1-chlorooctane 30.85
    1-chlorotetradecane 16.64
    n-nonane 11.49
    undecane 9.35
    tert-butylcyclohexane 12.44
    cyclooctane 9.21
    cyclopentanol 83.57
    tetrahydropyran 125.06
    tert-amyl methyl ether 70.09
    2,5,8-trioxanonane 140.3
    1-hexene 34.93
    2-isopropoxyethanol 71.64
    2,2,2-trifluoroethanol 60.08
    methyl butyrate 60.01

    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