Potassium Chromate

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  • Identifiers

    CAS number
    7789-00-6

    Molecular formula
    CrK2O4

    SMILES
    [O-][Cr](=O)(=O)[O-].[K+].[K+]

    Safety labels

    Irritant
    Irritant

    Health Hazard
    Health

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Odorless 89.96%
    Sour 20.34%
    Sharp 14.64%
    Clean 13.6%
    Pungent 10.71%
    Bitter 10.49%
    Sweet 10.42%
    Burnt 10.27%
    Ethereal 9.76%
    Winey 9.29%

     

    Flavor
    Odorless 56.85%
    Bitter 32.88%
    Bland 22.14%
    Sour 21.92%
    Formyl 21.06%
    Mousy 19.86%
    Rotten 19.82%
    Urine 19.58%
    Nitrile 19.03%
    Yeast 18.98%

     

  • Properties

    pKa est.
    -19.92 (strong acid)

    Molecular weight
    194.19 g/mol

    Melting point expt.

    • 975 °C
    • 968 °C

    Boiling point

    • 1000 °C

    Flash point

    • -9.66 ˚C est.

    Solubility expt.

    • In water, 65.0 g/100 g water at 25 °C
    • In water, 39.96 wt% at 20 °C; 45.0 wt% at 100 °C
    • 62.9 g/100 cc water at 20 °C; 79.2 g/100 cc water at 100 °C
    • Insoluble in alcohol, acetone, phenyl cyanide
    • Solubility in water, g/100ml at 20 °C: 62.9 (good)

  • Synonyms

    • POTASSIUM CHROMATE
    • 7789-00-6
    • Bipotassium chromate
    • Potassium chromate(VI)
    • Dipotassium chromate
    • Dipotassium monochromate
    • Chromate of potash
    • Chromate of potass
    • Neutral potassium chromate
    • Caswell No. 687
    • Chromic acid, dipotassium salt
    • Potassium chromate (K2(CrO4))
    • CCRIS 882
    • HSDB 1249
    • dipotassium;dioxido(dioxo)chromium
    • EINECS 232-140-5
    • UNII-5P0R38CN2X
    • EPA Pesticide Chemical Code 068301
    • 5P0R38CN2X
    • Chromic acid (H2CrO4), dipotassium salt
    • KALI CHROMICUM
    • dipotassium dioxido(dioxo)chromium
    • POTASSIUM CHROMATE (VI)
    • Tarapacaite
    • DTXSID8064858
    • CHEBI:75249
    • EC 232-140-5
    • MFCD00011368
    • 18453-57-1
    • CHROMIC ACID (H2CRO4), DIPOTASSIUM SALT (1:2)
    • Dipotassium chromate (K2CrO4)
    • 51Cr-Potassium chromate
    • dipotassium chromate(2-)
    • Chromate of potassium
    • Pesticide Code 068301.
    • KALI CHROMICUM [HPUS]
    • Potassium chromate, ACS grade
    • DTXCID4048062
    • POTASSIUM CHROMATE [HSDB]
    • POTASSIUM CHROMATE(VI) [MI]
    • AKOS015902665
    • AKOS025243253
    • NS00113210
    • Chromic acid (H2CrO4), potassium salt (1:2)
    • Q407939
    • 232-140-5

  • Applications

    Potassium Chromate is used as an analytical reagent in qualitative inorganic analysis, notably for detecting lead by forming a bright yellow precipitate PbCrO4. It also serves as a key precursor in the synthesis of other chromium(VI) reagents, including potassium dichromate and chromic acid. In metal surface treatment, potassium chromate-based solutions participate in chromate conversion coatings that enhance corrosion resistance on aluminum and steel substrates. It is employed as a pigment/colorant in coatings, ceramics, and glass, imparting a yellow hue. In certain formulation contexts, it may be considered for dyeing or indicator roles in specialty inks. Subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 484.0
    methanol 749.04
    isopropanol 423.77
    water 328.84
    ethyl acetate 129.48
    n-propanol 309.49
    acetone 367.8
    n-butanol 270.91
    acetonitrile 211.74
    DMF 1164.46
    toluene 59.93
    isobutanol 196.37
    1,4-dioxane 257.45
    methyl acetate 145.43
    THF 445.19
    2-butanone 190.25
    n-pentanol 180.26
    sec-butanol 285.71
    n-hexane 48.27
    ethylene glycol 433.3
    NMP 443.65
    cyclohexane 52.45
    DMSO 1173.36
    n-butyl acetate 64.44
    n-octanol 124.67
    chloroform 160.35
    n-propyl acetate 83.95
    acetic acid 226.59
    dichloromethane 200.25
    cyclohexanone 133.88
    propylene glycol 272.04
    isopropyl acetate 99.96
    DMAc 602.63
    2-ethoxyethanol 370.82
    isopentanol 185.43
    n-heptane 46.82
    ethyl formate 146.21
    1,2-dichloroethane 183.1
    n-hexanol 153.6
    2-methoxyethanol 784.99
    isobutyl acetate 44.24
    tetrachloromethane 59.92
    n-pentyl acetate 76.19
    transcutol 271.14
    n-heptanol 118.95
    ethylbenzene 39.04
    MIBK 119.73
    2-propoxyethanol 292.6
    tert-butanol 434.55
    MTBE 230.31
    2-butoxyethanol 189.17
    propionic acid 147.63
    o-xylene 65.71
    formic acid 384.62
    diethyl ether 290.86
    m-xylene 60.76
    p-xylene 41.72
    chlorobenzene 46.27
    dimethyl carbonate 146.81
    n-octane 27.38
    formamide 559.9
    cyclopentanone 211.77
    2-pentanone 194.13
    anisole 99.5
    cyclopentyl methyl ether 212.45
    gamma-butyrolactone 204.95
    1-methoxy-2-propanol 535.67
    pyridine 136.91
    3-pentanone 147.12
    furfural 213.59
    n-dodecane 21.25
    diethylene glycol 380.01
    diisopropyl ether 99.51
    tert-amyl alcohol 301.95
    acetylacetone 160.04
    n-hexadecane 22.13
    acetophenone 85.82
    methyl propionate 165.95
    isopentyl acetate 50.98
    trichloroethylene 155.72
    n-nonanol 110.78
    cyclohexanol 180.6
    benzyl alcohol 102.38
    2-ethylhexanol 76.63
    isooctanol 83.39
    dipropyl ether 121.89
    1,2-dichlorobenzene 52.96
    ethyl lactate 95.18
    propylene carbonate 99.57
    n-methylformamide 491.14
    2-pentanol 242.57
    n-pentane 94.06
    1-propoxy-2-propanol 196.83
    1-methoxy-2-propyl acetate 91.76
    2-(2-methoxypropoxy) propanol 128.97
    mesitylene 50.39
    ε-caprolactone 109.96
    p-cymene 38.9
    epichlorohydrin 232.84
    1,1,1-trichloroethane 91.5
    2-aminoethanol 419.6
    morpholine-4-carbaldehyde 385.38
    sulfolane 329.23
    2,2,4-trimethylpentane 30.86
    2-methyltetrahydrofuran 233.25
    n-hexyl acetate 89.15
    isooctane 26.69
    2-(2-butoxyethoxy)ethanol 176.53
    sec-butyl acetate 54.18
    tert-butyl acetate 110.59
    decalin 19.56
    glycerin 449.87
    diglyme 268.4
    acrylic acid 145.69
    isopropyl myristate 55.21
    n-butyric acid 150.5
    acetyl acetate 67.93
    di(2-ethylhexyl) phthalate 48.48
    ethyl propionate 89.63
    nitromethane 332.62
    1,2-diethoxyethane 119.23
    benzonitrile 64.57
    trioctyl phosphate 50.02
    1-bromopropane 130.57
    gamma-valerolactone 235.01
    n-decanol 91.16
    triethyl phosphate 47.91
    4-methyl-2-pentanol 125.53
    propionitrile 146.76
    vinylene carbonate 90.97
    1,1,2-trichlorotrifluoroethane 219.27
    DMS 66.65
    cumene 34.97
    2-octanol 97.54
    2-hexanone 100.22
    octyl acetate 67.59
    limonene 55.7
    1,2-dimethoxyethane 427.65
    ethyl orthosilicate 49.31
    tributyl phosphate 45.89
    diacetone alcohol 193.31
    N,N-dimethylaniline 120.66
    acrylonitrile 170.61
    aniline 118.61
    1,3-propanediol 417.54
    bromobenzene 38.97
    dibromomethane 159.22
    1,1,2,2-tetrachloroethane 173.71
    2-methyl-cyclohexyl acetate 51.33
    tetrabutyl urea 81.19
    diisobutyl methanol 64.3
    2-phenylethanol 90.29
    styrene 41.94
    dioctyl adipate 60.95
    dimethyl sulfate 245.16
    ethyl butyrate 63.74
    methyl lactate 194.31
    butyl lactate 76.37
    diethyl carbonate 45.7
    propanediol butyl ether 160.1
    triethyl orthoformate 56.36
    p-tert-butyltoluene 43.18
    methyl 4-tert-butylbenzoate 110.21
    morpholine 322.63
    tert-butylamine 293.14
    n-dodecanol 75.13
    dimethoxymethane 646.43
    ethylene carbonate 79.85
    cyrene 126.05
    2-ethoxyethyl acetate 83.53
    2-ethylhexyl acetate 42.48
    1,2,4-trichlorobenzene 58.24
    4-methylpyridine 127.28
    dibutyl ether 80.61
    2,6-dimethyl-4-heptanol 64.3
    DEF 283.61
    dimethyl isosorbide 152.87
    tetrachloroethylene 138.14
    eugenol 127.3
    triacetin 77.36
    span 80 115.56
    1,4-butanediol 194.05
    1,1-dichloroethane 136.19
    2-methyl-1-pentanol 119.42
    methyl formate 329.66
    2-methyl-1-butanol 176.11
    n-decane 31.38
    butyronitrile 134.68
    3,7-dimethyl-1-octanol 82.04
    1-chlorooctane 62.98
    1-chlorotetradecane 33.48
    n-nonane 31.97
    undecane 25.11
    tert-butylcyclohexane 19.73
    cyclooctane 30.3
    cyclopentanol 220.16
    tetrahydropyran 185.6
    tert-amyl methyl ether 199.73
    2,5,8-trioxanonane 211.18
    1-hexene 81.75
    2-isopropoxyethanol 231.19
    2,2,2-trifluoroethanol 167.3
    methyl butyrate 104.64

    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