Potassium hydrogen oxalate

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  • Identifiers

    CAS number
    127-95-7

    Molecular formula
    C2HKO4

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

    Safety labels

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Odorless 65.13%
    Caramellic 42.72%
    Sour 39.44%
    Burnt 34.44%
    Sharp 26.81%
    Buttery 25.48%
    Sweet 23.22%
    Winey 21.48%
    Creamy 20.18%
    Clean 20.09%

     

    Flavor
    Odorless 54.6%
    Sour 39.02%
    Very mild 33.38%
    Caramellic 30.8%
    Nutty 28.19%
    Musty 22.14%
    Yeast 20.59%
    Urine 20.32%
    Acetoin 20.19%
    Acidic 20.15%

     

    Odor impact est.
    Low

  • Properties

    pKa est.
    1.89 (strong acid)

    Molecular weight
    128.13 g/mol

    Melting point expt.

    • Decomposes

    Flash point

    • 115.46 ˚C est.

  • Synonyms

    • Potassium hydrogen oxalate
    • Potassium binoxalate
    • 127-95-7
    • Kleesalz
    • POTASSIUM ACID OXALATE
    • Salt of sorrel
    • Sorrel salt
    • Sal Acetosella
    • Potassium oxalate (KHC2O4)
    • Essential salt of lemon
    • Potassium salt of sorrel
    • Oxalic acid, monopotassium salt
    • L3W2519LG2
    • DTXSID6059572
    • RefChem:1096539
    • DTXCID4033891
    • 204-873-0
    • Potassium carboxyformate
    • Ethanedioic acid, potassium salt (1:1)
    • Monopotassium oxalate
    • Ethanedioic acid, monopotassium salt
    • potassium;2-hydroxy-2-oxoacetate
    • Kleesalz [German]
    • SCHEMBL106862
    • C2HKO4
    • HSDB 671
    • EINECS 204-873-0
    • UNII-L3W2519LG2
    • Potassium binoxylate
    • MFCD00036407
    • EC 204-873-0
    • SCHEMBL106863
    • Potassium hydrogen ethanedioate
    • orb2939828
    • POTASSIUM BINOXALATE [MI]
    • JMTCDHVHZSGGJA-UHFFFAOYSA-M
    • potassium;2-hydroxy-2-oxo-acetate
    • AKOS027382595
    • FP40448
    • HY-W115775
    • CS-0198035
    • NS00078118
    • F868837
    • Q906025
    • 127-95-7

  • Applications

    Potassium hydrogen oxalate (CAS 127-95-7) is used primarily as a chemical reagent and oxalate source in analytical chemistry, notably for oxalate-focused titration standards and quantitative methods. It also serves as a chelating/sequestering agent in cleaning formulations and water-treatment contexts to reduce scale and stabilize metal ions. In organic synthesis, it can be employed as a precursor or intermediate to oxalate-derived compounds and metal complexes. Additionally, it finds use as an additive to stabilize and regulate metal ion activity in coatings, inks, and plastics formulations.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 623.32
    methanol 1197.7
    isopropanol 274.92
    water 493.74
    ethyl acetate 40.08
    n-propanol 273.71
    acetone 193.71
    n-butanol 195.59
    acetonitrile 62.12
    DMF 1176.1
    toluene 9.51
    isobutanol 122.88
    1,4-dioxane 101.88
    methyl acetate 65.81
    THF 128.14
    2-butanone 100.81
    n-pentanol 110.19
    sec-butanol 173.92
    n-hexane 4.81
    ethylene glycol 613.4
    NMP 413.07
    cyclohexane 10.06
    DMSO 2116.2
    n-butyl acetate 19.61
    n-octanol 45.95
    chloroform 7.5
    n-propyl acetate 22.3
    acetic acid 364.01
    dichloromethane 19.87
    cyclohexanone 50.03
    propylene glycol 334.2
    isopropyl acetate 24.23
    DMAc 674.42
    2-ethoxyethanol 402.33
    isopentanol 125.73
    n-heptane 10.59
    ethyl formate 75.86
    1,2-dichloroethane 30.6
    n-hexanol 59.26
    2-methoxyethanol 896.67
    isobutyl acetate 5.33
    tetrachloromethane 2.61
    n-pentyl acetate 24.32
    transcutol 382.07
    n-heptanol 54.72
    ethylbenzene 5.55
    MIBK 32.01
    2-propoxyethanol 161.03
    tert-butanol 231.67
    MTBE 69.8
    2-butoxyethanol 137.29
    propionic acid 130.28
    o-xylene 13.68
    formic acid 851.59
    diethyl ether 72.24
    m-xylene 8.26
    p-xylene 4.9
    chlorobenzene 3.37
    dimethyl carbonate 47.65
    n-octane 5.43
    formamide 1255.55
    cyclopentanone 66.31
    2-pentanone 75.42
    anisole 20.44
    cyclopentyl methyl ether 51.06
    gamma-butyrolactone 76.83
    1-methoxy-2-propanol 445.71
    pyridine 54.3
    3-pentanone 44.92
    furfural 86.97
    n-dodecane 3.65
    diethylene glycol 298.26
    diisopropyl ether 17.2
    tert-amyl alcohol 194.08
    acetylacetone 62.89
    n-hexadecane 3.64
    acetophenone 22.58
    methyl propionate 62.5
    isopentyl acetate 12.6
    trichloroethylene 19.26
    n-nonanol 40.29
    cyclohexanol 74.27
    benzyl alcohol 45.49
    2-ethylhexanol 24.89
    isooctanol 35.48
    dipropyl ether 27.82
    1,2-dichlorobenzene 3.25
    ethyl lactate 36.06
    propylene carbonate 22.44
    n-methylformamide 677.26
    2-pentanol 115.7
    n-pentane 14.17
    1-propoxy-2-propanol 95.51
    1-methoxy-2-propyl acetate 32.66
    2-(2-methoxypropoxy) propanol 86.92
    mesitylene 6.48
    ε-caprolactone 49.37
    p-cymene 6.9
    epichlorohydrin 82.58
    1,1,1-trichloroethane 4.58
    2-aminoethanol 604.9
    morpholine-4-carbaldehyde 352.58
    sulfolane 173.59
    2,2,4-trimethylpentane 4.87
    2-methyltetrahydrofuran 71.98
    n-hexyl acetate 27.73
    isooctane 2.88
    2-(2-butoxyethoxy)ethanol 159.43
    sec-butyl acetate 10.95
    tert-butyl acetate 26.1
    decalin 2.44
    glycerin 470.6
    diglyme 239.72
    acrylic acid 159.5
    isopropyl myristate 11.39
    n-butyric acid 105.4
    acetyl acetate 13.77
    di(2-ethylhexyl) phthalate 11.51
    ethyl propionate 19.0
    nitromethane 357.19
    1,2-diethoxyethane 56.66
    benzonitrile 11.25
    trioctyl phosphate 13.59
    1-bromopropane 17.24
    gamma-valerolactone 140.53
    n-decanol 32.77
    triethyl phosphate 8.17
    4-methyl-2-pentanol 46.29
    propionitrile 37.01
    vinylene carbonate 21.6
    1,1,2-trichlorotrifluoroethane 100.16
    DMS 14.97
    cumene 4.64
    2-octanol 34.14
    2-hexanone 28.01
    octyl acetate 20.01
    limonene 12.62
    1,2-dimethoxyethane 263.31
    ethyl orthosilicate 8.5
    tributyl phosphate 10.61
    diacetone alcohol 111.98
    N,N-dimethylaniline 30.34
    acrylonitrile 56.84
    aniline 34.95
    1,3-propanediol 563.3
    bromobenzene 2.23
    dibromomethane 12.9
    1,1,2,2-tetrachloroethane 21.46
    2-methyl-cyclohexyl acetate 8.31
    tetrabutyl urea 28.85
    diisobutyl methanol 18.73
    2-phenylethanol 29.03
    styrene 6.25
    dioctyl adipate 16.04
    dimethyl sulfate 102.06
    ethyl butyrate 15.81
    methyl lactate 112.63
    butyl lactate 34.67
    diethyl carbonate 7.85
    propanediol butyl ether 134.12
    triethyl orthoformate 12.45
    p-tert-butyltoluene 7.38
    methyl 4-tert-butylbenzoate 37.26
    morpholine 201.16
    tert-butylamine 98.49
    n-dodecanol 25.5
    dimethoxymethane 308.52
    ethylene carbonate 17.9
    cyrene 62.64
    2-ethoxyethyl acetate 38.41
    2-ethylhexyl acetate 8.22
    1,2,4-trichlorobenzene 4.43
    4-methylpyridine 42.0
    dibutyl ether 22.28
    2,6-dimethyl-4-heptanol 18.73
    DEF 198.74
    dimethyl isosorbide 55.7
    tetrachloroethylene 19.58
    eugenol 47.06
    triacetin 21.41
    span 80 64.61
    1,4-butanediol 252.1
    1,1-dichloroethane 11.02
    2-methyl-1-pentanol 70.13
    methyl formate 321.76
    2-methyl-1-butanol 121.47
    n-decane 5.38
    butyronitrile 38.75
    3,7-dimethyl-1-octanol 27.13
    1-chlorooctane 9.5
    1-chlorotetradecane 4.8
    n-nonane 5.53
    undecane 4.33
    tert-butylcyclohexane 1.75
    cyclooctane 5.71
    cyclopentanol 81.65
    tetrahydropyran 55.32
    tert-amyl methyl ether 69.35
    2,5,8-trioxanonane 174.93
    1-hexene 10.75
    2-isopropoxyethanol 155.08
    2,2,2-trifluoroethanol 121.9
    methyl butyrate 32.3

    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