Potassium arsenate

Overview IFRA Request a quote

  • Identifiers

    CAS number
    7784-41-0

    Molecular formula
    AsH2KO4

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

    Safety labels

    Acute Toxic
    Acute Toxic

    Health Hazard
    Health

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Odorless 81.73%
    Sour 22.91%
    Clean 17.5%
    Sharp 17.0%
    Pungent 13.95%
    Alcoholic 12.33%
    Sweaty 11.57%
    Savory 11.44%
    Cheesy 10.98%
    Ethereal 10.87%

     

    Flavor
    Odorless 71.75%
    Sour 40.41%
    Vinegar 30.64%
    Pungent 26.72%
    Bland 22.83%
    Acidic 22.61%
    Formyl 21.82%
    Sharp 21.45%
    Soy 20.77%
    Mousy 20.08%

     

  • Properties

    pKa est.
    -4.36 (strong acid)

    Molecular weight
    180.033 g/mol

    Melting point expt.

    • 550 °F (USCG, 1999)
    • 288 °C

    Flash point

    • 233.39 ˚C est.

    Solubility expt.

    • Sol in 5.5 parts cold water. Very soluble in hot water.
    • Slowly soluble in 1.6 parts glycerol. Insoluble in alcohol.
    • Sol in ammonia, acid
    • Solubility in water, g/100ml at 6 °C: 19 (good)

  • Synonyms

    • POTASSIUM ARSENATE
    • 7784-41-0
    • Potassium dihydrogen arsenate
    • Macquer's salt
    • Potassium arsenate monobasic
    • Monopotassium arsenate
    • Potassium acid arsenate
    • Potassium hydrogen arsenate
    • Potassium dihydrogenarsenate
    • Potassium arsenate, monobasic
    • Arsenic acid, monopotassium salt
    • Monopotassium dihydrogen arsenate
    • HSDB 1235
    • EINECS 232-065-8
    • potassium;dihydrogen arsorate
    • UN1677
    • UNII-55K74GS94Q
    • Potassium hydrogen arsenate (KH2AsO4)
    • Potassium dihydrogen arsenate (KH2AsO4)
    • Arsenic acid (H3AsO4), monopotassium salt
    • 55K74GS94Q
    • KH2AsO4
    • POTASSIUM ARSENATE [MI]
    • DTXSID9041100
    • POTASSIUM ARSENATE [HSDB]
    • Potassium orthoarsenate, monobasic
    • POTASSIUM ARSENATE, (SOLID)
    • POTASSIUM ARSENATE, [SOLID]
    • Potassium arsenic acid
    • (potassiooxy)arsonic acid
    • DTXCID7021100
    • GVPLVOGUVQAPNJ-UHFFFAOYSA-M
    • DIHYDROGEN POTASSIUM ARSENATE
    • POTASSIUM ARSENATE (KH2ASO4)
    • FP30728
    • POTASSIUM DIHYDROGEN ORTHOARSENATE
    • Potassium arsenate [UN1677] [Poison]
    • HYDROGEN POTASSIUM ARSENATE (H2KASO4)
    • Arsenic acid (H3AsO4), potassium salt (1:1)
    • Q2660286

  • Applications

    Potassium arsenate (CAS 7784-41-0) is historically used as an arsenic-containing pesticide in agriculture to control certain insects and pests, and has also been employed in wood preservation formulations to protect timber from decay. In analytical chemistry, potassium arsenate serves as a reference standard and testing reagent for arsenic and arsenate determination. It also functions as a precursor or intermediate in the synthesis of other arsenate compounds for industrial use. Use is subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 547.24
    methanol 1067.97
    isopropanol 426.07
    water 1531.7
    ethyl acetate 54.45
    n-propanol 324.07
    acetone 504.15
    n-butanol 212.55
    acetonitrile 194.43
    DMF 1783.6
    toluene 24.76
    isobutanol 199.03
    1,4-dioxane 247.23
    methyl acetate 101.14
    THF 506.31
    2-butanone 146.54
    n-pentanol 148.25
    sec-butanol 191.51
    n-hexane 21.05
    ethylene glycol 787.24
    NMP 581.05
    cyclohexane 27.91
    DMSO 1607.11
    n-butyl acetate 46.26
    n-octanol 62.43
    chloroform 31.31
    n-propyl acetate 58.71
    acetic acid 294.88
    dichloromethane 51.63
    cyclohexanone 115.09
    propylene glycol 483.17
    isopropyl acetate 43.55
    DMAc 759.54
    2-ethoxyethanol 420.4
    isopentanol 132.79
    n-heptane 24.09
    ethyl formate 108.93
    1,2-dichloroethane 67.96
    n-hexanol 105.1
    2-methoxyethanol 800.23
    isobutyl acetate 32.64
    tetrachloromethane 14.07
    n-pentyl acetate 40.67
    transcutol 273.8
    n-heptanol 72.91
    ethylbenzene 14.08
    MIBK 72.89
    2-propoxyethanol 309.92
    tert-butanol 344.05
    MTBE 84.71
    2-butoxyethanol 185.34
    propionic acid 161.42
    o-xylene 25.15
    formic acid 578.6
    diethyl ether 121.69
    m-xylene 23.46
    p-xylene 16.28
    chlorobenzene 12.88
    dimethyl carbonate 126.19
    n-octane 9.5
    formamide 768.47
    cyclopentanone 230.97
    2-pentanone 122.23
    anisole 48.08
    cyclopentyl methyl ether 141.34
    gamma-butyrolactone 206.87
    1-methoxy-2-propanol 553.75
    pyridine 110.44
    3-pentanone 84.18
    furfural 197.58
    n-dodecane 6.5
    diethylene glycol 437.76
    diisopropyl ether 34.79
    tert-amyl alcohol 158.06
    acetylacetone 124.6
    n-hexadecane 6.69
    acetophenone 53.62
    methyl propionate 100.16
    isopentyl acetate 31.63
    trichloroethylene 48.09
    n-nonanol 54.84
    cyclohexanol 110.13
    benzyl alcohol 76.89
    2-ethylhexanol 40.63
    isooctanol 45.18
    dipropyl ether 81.35
    1,2-dichlorobenzene 12.57
    ethyl lactate 90.16
    propylene carbonate 75.85
    n-methylformamide 694.7
    2-pentanol 134.35
    n-pentane 36.45
    1-propoxy-2-propanol 204.63
    1-methoxy-2-propyl acetate 72.96
    2-(2-methoxypropoxy) propanol 119.87
    mesitylene 19.62
    ε-caprolactone 85.27
    p-cymene 15.02
    epichlorohydrin 176.16
    1,1,1-trichloroethane 24.2
    2-aminoethanol 703.41
    morpholine-4-carbaldehyde 494.6
    sulfolane 315.3
    2,2,4-trimethylpentane 7.52
    2-methyltetrahydrofuran 152.11
    n-hexyl acetate 43.73
    isooctane 7.69
    2-(2-butoxyethoxy)ethanol 174.59
    sec-butyl acetate 29.17
    tert-butyl acetate 50.22
    decalin 6.93
    glycerin 699.79
    diglyme 299.5
    acrylic acid 185.03
    isopropyl myristate 24.59
    n-butyric acid 113.13
    acetyl acetate 35.6
    di(2-ethylhexyl) phthalate 31.74
    ethyl propionate 50.8
    nitromethane 409.98
    1,2-diethoxyethane 78.78
    benzonitrile 37.57
    trioctyl phosphate 31.31
    1-bromopropane 38.18
    gamma-valerolactone 262.02
    n-decanol 44.23
    triethyl phosphate 31.19
    4-methyl-2-pentanol 65.73
    propionitrile 109.48
    vinylene carbonate 68.79
    1,1,2-trichlorotrifluoroethane 187.24
    DMS 39.91
    cumene 12.85
    2-octanol 43.6
    2-hexanone 74.36
    octyl acetate 35.41
    limonene 20.53
    1,2-dimethoxyethane 454.9
    ethyl orthosilicate 30.67
    tributyl phosphate 28.45
    diacetone alcohol 134.54
    N,N-dimethylaniline 69.08
    acrylonitrile 151.12
    aniline 66.96
    1,3-propanediol 462.63
    bromobenzene 8.7
    dibromomethane 36.94
    1,1,2,2-tetrachloroethane 52.6
    2-methyl-cyclohexyl acetate 32.32
    tetrabutyl urea 62.8
    diisobutyl methanol 30.71
    2-phenylethanol 61.69
    styrene 15.93
    dioctyl adipate 39.1
    dimethyl sulfate 211.69
    ethyl butyrate 43.41
    methyl lactate 174.54
    butyl lactate 65.07
    diethyl carbonate 30.69
    propanediol butyl ether 159.97
    triethyl orthoformate 42.1
    p-tert-butyltoluene 17.43
    methyl 4-tert-butylbenzoate 68.0
    morpholine 346.71
    tert-butylamine 190.39
    n-dodecanol 36.68
    dimethoxymethane 665.43
    ethylene carbonate 64.4
    cyrene 142.44
    2-ethoxyethyl acetate 51.16
    2-ethylhexyl acetate 23.82
    1,2,4-trichlorobenzene 15.45
    4-methylpyridine 79.01
    dibutyl ether 34.52
    2,6-dimethyl-4-heptanol 30.71
    DEF 190.08
    dimethyl isosorbide 156.84
    tetrachloroethylene 43.23
    eugenol 104.51
    triacetin 51.66
    span 80 106.59
    1,4-butanediol 281.68
    1,1-dichloroethane 40.84
    2-methyl-1-pentanol 72.09
    methyl formate 458.5
    2-methyl-1-butanol 120.83
    n-decane 9.11
    butyronitrile 91.56
    3,7-dimethyl-1-octanol 37.38
    1-chlorooctane 17.58
    1-chlorotetradecane 10.29
    n-nonane 9.35
    undecane 7.41
    tert-butylcyclohexane 5.9
    cyclooctane 13.83
    cyclopentanol 209.3
    tetrahydropyran 136.19
    tert-amyl methyl ether 65.66
    2,5,8-trioxanonane 236.86
    1-hexene 34.52
    2-isopropoxyethanol 217.79
    2,2,2-trifluoroethanol 210.93
    methyl butyrate 72.44

    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