Oxalic acid dihydrate

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  • Identifiers

    CAS number
    6153-56-6

    Molecular formula
    C2H6O6

    SMILES
    C(=O)(C(=O)O)O.O.O

    Safety labels

    Corrosive
    Corrosive

    Irritant
    Irritant

    Health Hazard
    Health

  • Odor profile

    Fragrance
    Odorless 63.64%
    Sour 45.77%
    Caramellic 43.66%
    Burnt 37.72%
    Sharp 29.8%
    Buttery 23.82%
    Clean 21.39%
    Winey 20.48%
    Creamy 19.09%
    Pungent 16.51%

     

    Flavor
    Odorless 57.32%
    Sour 46.26%
    Caramellic 32.17%
    Very mild 32.11%
    Acidic 24.67%
    Sharp 22.97%
    Nutty 22.0%
    Formyl 20.76%
    Acetoin 20.58%
    Urine 20.58%

     

    Odor impact est.
    Low

  • Properties

    pKa est.
    2.83 (strong acid)

    Molecular weight
    126.07 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Moderately fast

    Boiling point est.
    179°C

    Melting point expt.

    • 101-102 °C

    Flash point

    • 144.32 ˚C est.

    Solubility expt.

    • Solubility in water, g/100ml at 20 °C: 13-14

  • Synonyms

    • Oxalic acid dihydrate
    • 6153-56-6
    • Ethanedioic acid, dihydrate
    • ETHANEDIOIC ACID DIHYDRATE
    • 0K2L2IJ59O
    • OXALICUM ACIDUM
    • DTXSID2075003
    • VARROMED COMPONENT OXALIC ACID DIHYDRATE
    • RefChem:1093935
    • DTXCID8043070
    • 612-167-2
    • Oxalic acid, dihydrate
    • MFCD00149102
    • OXALIC ACID (1,2-13C2)
    • UNII-0K2L2IJ59O
    • Oxalicaciddihydrate
    • oxalicacid dihydrate
    • dihydrate oxalic acid
    • oxalic acid di-hydrate
    • alpha oxalic acid dihydrate
    • Oxalic Acid Dihydrate CRS
    • HO2CCO2H.2H2O
    • SCHEMBL25849
    • Oxalic acid dihydrate, 97%
    • Oxalic acid--water (1/2)
    • OXALICUM ACIDUM [HPUS]
    • C2H6O6
    • orb1302125
    • CHEMBL5315063
    • OXALIC ACID DIHYDRATE [MI]
    • AKOS015892953
    • EBC-616203
    • FO35064
    • OXALIC ACID DIHYDRATE [WHO-DD]
    • Oxalic acid dihydrate, puriss., >=99%
    • Oxalic acid dihydrate, 99.5%, ACS reagent
    • Oxalic acid dihydrate, ACS reagent, >=99%
    • Oxalic acid dihydrate, purum, >=99.0% (RT)
    • F094439
    • Oxalic acid dihydrate, BioUltra, >=99.5% (RT)
    • OXALIC ACID DIHYDRATE [EMA EPAR VETERINARY]
    • Oxalic acid dihydrate, 99.999% trace metals basis
    • Oxalic acid dihydrate, Vetec(TM) reagent grade, 98%
    • Q27236881
    • Oxalic acid dihydrate, ReagentPlus(R), >=99.0% (GC)
    • Oxalic acid dihydrate, SAJ first grade, 99.0-101.0%
    • Oxalic acid dihydrate, JIS special grade, 99.5-100.2%
    • Oxalic acid dihydrate, p.a., ACS reagent, 99.5-102.5%
    • Oxalic acid dihydrate, p.a., ACS reagent, reag. ISO, reag. Ph. Eur., 99.5-102.0%
    • Oxalic acid dihydrate, puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., >=99.5% (manganometric)
    • 6153-56-6

  • Applications

    Oxalic acid dihydrate (CAS 6153-56-6) is a versatile chemical used in cleaning, bleaching, and analytical applications. In industry, it acts as a chelating agent to sequester metal ions in detergents and cleaners and as a reducing agent for rust and oxide removal on metal surfaces. In wood and textile processing, it serves as a bleaching agent to remove tannins and brighten materials. In analytical chemistry, oxalic acid dihydrate is a common primary standard and reductant for redox titrations (e.g., standardizing permanganate solutions). It also serves as an intermediate for producing oxalate salts and related compounds used in further synthesis. Use is subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 94.21
    methanol 140.67
    isopropanol 37.37
    water 104.31
    ethyl acetate 5.43
    n-propanol 38.38
    acetone 18.06
    n-butanol 24.37
    acetonitrile 7.01
    DMF 127.61
    toluene 0.89
    isobutanol 15.86
    1,4-dioxane 15.95
    methyl acetate 8.63
    THF 20.0
    2-butanone 11.35
    n-pentanol 12.54
    sec-butanol 24.22
    n-hexane 1.07
    ethylene glycol 84.19
    NMP 49.24
    cyclohexane 1.77
    DMSO 226.01
    n-butyl acetate 1.84
    n-octanol 4.69
    chloroform 1.31
    n-propyl acetate 1.85
    acetic acid 83.75
    dichloromethane 2.82
    cyclohexanone 5.14
    propylene glycol 49.83
    isopropyl acetate 3.04
    DMAc 77.0
    2-ethoxyethanol 49.69
    isopentanol 14.23
    n-heptane 1.97
    ethyl formate 10.59
    1,2-dichloroethane 3.71
    n-hexanol 6.32
    2-methoxyethanol 122.18
    isobutyl acetate 0.43
    tetrachloromethane 0.78
    n-pentyl acetate 2.68
    transcutol 35.36
    n-heptanol 6.33
    ethylbenzene 0.65
    MIBK 3.15
    2-propoxyethanol 18.43
    tert-butanol 28.55
    MTBE 9.82
    2-butoxyethanol 19.19
    propionic acid 19.79
    o-xylene 1.38
    formic acid 165.94
    diethyl ether 11.3
    m-xylene 0.78
    p-xylene 0.59
    chlorobenzene 0.3
    dimethyl carbonate 5.55
    n-octane 1.01
    formamide 231.07
    cyclopentanone 8.25
    2-pentanone 7.57
    anisole 1.84
    cyclopentyl methyl ether 6.12
    gamma-butyrolactone 10.09
    1-methoxy-2-propanol 52.96
    pyridine 6.34
    3-pentanone 5.4
    furfural 9.87
    n-dodecane 0.48
    diethylene glycol 33.09
    diisopropyl ether 2.47
    tert-amyl alcohol 25.15
    acetylacetone 5.76
    n-hexadecane 0.49
    acetophenone 1.89
    methyl propionate 7.22
    isopentyl acetate 1.15
    trichloroethylene 2.22
    n-nonanol 4.23
    cyclohexanol 8.66
    benzyl alcohol 4.01
    2-ethylhexanol 2.51
    isooctanol 3.86
    dipropyl ether 4.06
    1,2-dichlorobenzene 0.29
    ethyl lactate 3.37
    propylene carbonate 2.92
    n-methylformamide 81.81
    2-pentanol 13.76
    n-pentane 2.42
    1-propoxy-2-propanol 10.7
    1-methoxy-2-propyl acetate 3.12
    2-(2-methoxypropoxy) propanol 9.78
    mesitylene 0.7
    ε-caprolactone 5.8
    p-cymene 0.73
    epichlorohydrin 10.49
    1,1,1-trichloroethane 0.75
    2-aminoethanol 98.23
    morpholine-4-carbaldehyde 38.61
    sulfolane 22.68
    2,2,4-trimethylpentane 0.87
    2-methyltetrahydrofuran 11.78
    n-hexyl acetate 2.58
    isooctane 0.44
    2-(2-butoxyethoxy)ethanol 17.3
    sec-butyl acetate 1.06
    tert-butyl acetate 3.02
    decalin 0.43
    glycerin 74.86
    diglyme 29.26
    acrylic acid 21.47
    isopropyl myristate 1.05
    n-butyric acid 14.83
    acetyl acetate 2.07
    di(2-ethylhexyl) phthalate 1.09
    ethyl propionate 1.98
    nitromethane 46.75
    1,2-diethoxyethane 6.54
    benzonitrile 0.93
    trioctyl phosphate 1.45
    1-bromopropane 2.49
    gamma-valerolactone 16.12
    n-decanol 3.26
    triethyl phosphate 0.98
    4-methyl-2-pentanol 5.09
    propionitrile 4.06
    vinylene carbonate 2.29
    1,1,2-trichlorotrifluoroethane 14.56
    DMS 1.52
    cumene 0.57
    2-octanol 3.67
    2-hexanone 2.51
    octyl acetate 1.76
    limonene 1.23
    1,2-dimethoxyethane 29.36
    ethyl orthosilicate 1.19
    tributyl phosphate 1.05
    diacetone alcohol 11.47
    N,N-dimethylaniline 3.02
    acrylonitrile 5.38
    aniline 3.43
    1,3-propanediol 84.46
    bromobenzene 0.19
    dibromomethane 2.01
    1,1,2,2-tetrachloroethane 2.78
    2-methyl-cyclohexyl acetate 0.69
    tetrabutyl urea 2.87
    diisobutyl methanol 2.07
    2-phenylethanol 2.54
    styrene 0.62
    dioctyl adipate 1.32
    dimethyl sulfate 11.04
    ethyl butyrate 1.65
    methyl lactate 12.85
    butyl lactate 4.0
    diethyl carbonate 0.86
    propanediol butyl ether 15.57
    triethyl orthoformate 1.59
    p-tert-butyltoluene 0.86
    methyl 4-tert-butylbenzoate 4.14
    morpholine 30.74
    tert-butylamine 13.32
    n-dodecanol 2.45
    dimethoxymethane 34.33
    ethylene carbonate 2.09
    cyrene 6.34
    2-ethoxyethyl acetate 4.31
    2-ethylhexyl acetate 0.78
    1,2,4-trichlorobenzene 0.39
    4-methylpyridine 3.86
    dibutyl ether 2.64
    2,6-dimethyl-4-heptanol 2.07
    DEF 23.46
    dimethyl isosorbide 6.18
    tetrachloroethylene 2.92
    eugenol 5.05
    triacetin 2.21
    span 80 7.35
    1,4-butanediol 30.17
    1,1-dichloroethane 1.5
    2-methyl-1-pentanol 7.64
    methyl formate 34.97
    2-methyl-1-butanol 15.26
    n-decane 0.81
    butyronitrile 4.63
    3,7-dimethyl-1-octanol 2.45
    1-chlorooctane 1.12
    1-chlorotetradecane 0.53
    n-nonane 0.89
    undecane 0.61
    tert-butylcyclohexane 0.29
    cyclooctane 1.01
    cyclopentanol 12.81
    tetrahydropyran 8.46
    tert-amyl methyl ether 9.26
    2,5,8-trioxanonane 20.44
    1-hexene 1.8
    2-isopropoxyethanol 17.13
    2,2,2-trifluoroethanol 26.8
    methyl butyrate 3.25

    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