Sodium Bisulfite

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  • Identifiers

    CAS number
    7631-90-5

    Molecular formula
    HNaO3S

    SMILES
    OS(=O)[O-].[Na+]

    Safety labels

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Odorless 84.83%
    Sulfurous 27.36%
    Savory 18.63%
    Cooked 18.1%
    Pungent 16.14%
    Sour 16.02%
    Meaty 15.62%
    Sharp 15.09%
    Roasted 14.65%
    Clean 13.4%

     

    Flavor
    Odorless 62.99%
    Sour 28.51%
    Bitter 25.59%
    Pungent 25.48%
    Bland 23.76%
    Formyl 23.46%
    Vinegar 23.4%
    Mild 22.31%
    Mousy 21.33%
    Soy 20.52%

     

    Odor impact est.
    High

  • Properties

    pKa est.
    -3.18 (strong acid)

    Molecular weight
    104.06 g/mol

    Melting point expt.

    • Decomposes (NIOSH, 2024)
    • less than 32 °F (USCG, 1999)
    • Decomposes
    • decomposes

    Boiling point

    • Decomposes (NIOSH, 2024)
    • greater than 212 °F at 760 mmHg (USCG, 1999)
    • 104 °C
    • decomposes
    • Decomposes

    Flash point

    • 116.4 ˚C est.

    Solubility expt.

    • 29 % (NIOSH, 2024)
    • Sol in 3.5 parts cold water, in 2 parts boiling water, in about 70 parts alcohol.
    • 29%

  • Synonyms

    • SODIUM BISULFITE
    • 7631-90-5
    • Sodium hydrogen sulfite
    • Sodium bisulphite
    • sodium hydrogensulfite
    • Monosodium sulfite
    • Sulfurous acid, monosodium salt
    • Sodium sulhydrate
    • Uantax SBS
    • Hydrogen sodium sulfite
    • Hydrogen sulfite sodium
    • Monosodic sulphite
    • Sodium hydrosulfite(DOT)
    • Bisulfite de sodium
    • Sodium bisulfite (1:1)
    • Sodium sulfite (NaHSO3)
    • Sodium bisulfite (NaHSO3)
    • Fr-62
    • Sulfurous acid, sodium salt (1:1)
    • INS NO.222
    • TZX5469Z6I
    • DTXSID8034902
    • INS-222
    • NSC-60680
    • E-222
    • CHEBI:26709
    • Sodium acid bisulfite
    • Monosodium salt of sulfurous acid
    • RefChem:6231
    • NaHSO(3)
    • DTXCID6014902
    • 231-548-0
    • Sodium acid sulfite
    • sodium hydrogen sulphite
    • HNaO3S
    • NaHSO3
    • Liquid of Sodium bisulfite
    • CHEMBL1689285
    • MFCD00003530
    • Caswell No. 750
    • Sodium bisulfite [JAN]
    • Bisulfite de sodium [French]
    • CCRIS 3950
    • HSDB 724
    • sodium hydrogensulphite
    • Sodium Bisulfite (mixture of NaHSO3 and Na2S2O5)
    • EINECS 231-548-0
    • NSC 60680
    • EPA Pesticide Chemical Code 078201
    • Sodium bisulfite [JAN:NF]
    • sodiumbisulfit
    • UNII-TZX5469Z6I
    • AI3-08582
    • sodium bi-sulphite
    • sodiumhydrogensulfit
    • saures Natriumsulfit
    • Natriumhydrogensulfit
    • sodiumhydrogensulphite
    • sodium hydogen sulfite
    • primaeres Natriumsulfit
    • sodium hydrogen-sulfite
    • sodium;hydrogen sulfite
    • (sodiooxy)sulfinic acid
    • E222
    • Sodium bisulfite solution
    • SCHEMBL889
    • Sodium bisulfite (JP18)
    • EC 231-548-0
    • DSSTox_CID_14902
    • DSSTox_GSID_47218
    • Sodium bisulfite, ACS Grade
    • SCHEMBL736237
    • SODIUM BISULFITE [II]
    • SODIUM BISULFITE [MI]
    • Sodium bisulfite, ACS reagent
    • SODIUM BISULFITE [FCC]
    • SODIUM BISULFITE [HSDB]
    • SCHEMBL10616712
    • SCHEMBL29351493
    • SODIUM BISULFITE [VANDF]
    • 40% Liquid of Sodium bisulfite
    • SODIUM BISULFITE [MART.]
    • SODIUM BISULFITE [WHO-DD]
    • Tox21_303826
    • AKOS015856800
    • DB14015
    • Sodium bisulfite - 38%-40% solution
    • NCGC00357103-01
    • BP-12336
    • FS157224
    • NS00076426
    • Sodium bisulfite, trace metals grade 99.95%
    • D02059
    • F075234
    • Q407891
    • F0001-1935
    • Sodium hydrogensulfite, mixture of NaHSO3 and Na2S2O5
    • EPA Method 5035, Low Level Clear Vial, 20% Bisulfate Solution, Stir Bar, Tared, 5 mL, 72/cs
    • 7631-90-5

  • Applications

    Sodium Bisulfite (CAS 7631-90-5) is a reducing agent and antioxidant used across industrial and consumer formulations. In food and beverages it functions as a sulfiting agent to prevent oxidation and preserve color, notably in wine, dried fruits, and fruit juices. In water treatment it acts as a chlorine scavenger to remove residual chlorine from process streams. In the pulp and paper industry it participates in sulfite pulping and serves as a mild bleaching/reducing agent to help remove color. In coatings, inks, and other polymer formulations it acts as a stabilizer and antioxidant to control oxidation during processing. In pharmaceutical and cosmetic manufacturing it may be used as an antioxidant/preservative under regulatory controls.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 346.67
    methanol 654.28
    isopropanol 255.23
    water 688.75
    ethyl acetate 86.73
    n-propanol 210.41
    acetone 441.37
    n-butanol 157.51
    acetonitrile 227.31
    DMF 1975.65
    toluene 32.24
    isobutanol 130.4
    1,4-dioxane 364.01
    methyl acetate 152.19
    THF 383.5
    2-butanone 159.37
    n-pentanol 111.05
    sec-butanol 138.23
    n-hexane 13.25
    ethylene glycol 414.53
    NMP 653.83
    cyclohexane 19.51
    DMSO 1545.19
    n-butyl acetate 48.83
    n-octanol 57.22
    chloroform 33.52
    n-propyl acetate 68.49
    acetic acid 268.9
    dichloromethane 71.17
    cyclohexanone 141.32
    propylene glycol 233.26
    isopropyl acetate 58.85
    DMAc 913.49
    2-ethoxyethanol 351.55
    isopentanol 115.09
    n-heptane 13.0
    ethyl formate 158.44
    1,2-dichloroethane 93.75
    n-hexanol 64.43
    2-methoxyethanol 672.66
    isobutyl acetate 35.86
    tetrachloromethane 11.68
    n-pentyl acetate 47.26
    transcutol 327.66
    n-heptanol 51.66
    ethylbenzene 18.92
    MIBK 71.65
    2-propoxyethanol 216.19
    tert-butanol 253.64
    MTBE 107.41
    2-butoxyethanol 140.69
    propionic acid 147.99
    o-xylene 36.91
    formic acid 461.96
    diethyl ether 128.29
    m-xylene 27.13
    p-xylene 23.11
    chlorobenzene 24.56
    dimethyl carbonate 165.19
    n-octane 6.58
    formamide 683.24
    cyclopentanone 213.96
    2-pentanone 121.45
    anisole 82.64
    cyclopentyl methyl ether 124.77
    gamma-butyrolactone 246.55
    1-methoxy-2-propanol 408.77
    pyridine 138.64
    3-pentanone 96.41
    furfural 308.74
    n-dodecane 6.4
    diethylene glycol 325.66
    diisopropyl ether 33.97
    tert-amyl alcohol 146.66
    acetylacetone 157.45
    n-hexadecane 6.79
    acetophenone 77.19
    methyl propionate 128.52
    isopentyl acetate 35.76
    trichloroethylene 71.61
    n-nonanol 52.5
    cyclohexanol 95.58
    benzyl alcohol 88.87
    2-ethylhexanol 31.73
    isooctanol 36.9
    dipropyl ether 62.44
    1,2-dichlorobenzene 24.94
    ethyl lactate 80.47
    propylene carbonate 101.59
    n-methylformamide 701.62
    2-pentanol 95.35
    n-pentane 20.15
    1-propoxy-2-propanol 135.45
    1-methoxy-2-propyl acetate 78.79
    2-(2-methoxypropoxy) propanol 135.69
    mesitylene 22.63
    ε-caprolactone 114.53
    p-cymene 15.86
    epichlorohydrin 229.29
    1,1,1-trichloroethane 30.13
    2-aminoethanol 380.2
    morpholine-4-carbaldehyde 642.14
    sulfolane 354.8
    2,2,4-trimethylpentane 6.96
    2-methyltetrahydrofuran 152.28
    n-hexyl acetate 57.72
    isooctane 5.79
    2-(2-butoxyethoxy)ethanol 179.34
    sec-butyl acetate 36.78
    tert-butyl acetate 61.76
    decalin 7.58
    glycerin 411.41
    diglyme 322.12
    acrylic acid 178.71
    isopropyl myristate 32.24
    n-butyric acid 109.25
    acetyl acetate 63.33
    di(2-ethylhexyl) phthalate 40.29
    ethyl propionate 65.38
    nitromethane 558.24
    1,2-diethoxyethane 102.47
    benzonitrile 61.39
    trioctyl phosphate 33.87
    1-bromopropane 42.96
    gamma-valerolactone 340.22
    n-decanol 45.02
    triethyl phosphate 36.55
    4-methyl-2-pentanol 52.54
    propionitrile 117.86
    vinylene carbonate 108.79
    1,1,2-trichlorotrifluoroethane 192.91
    DMS 62.12
    cumene 17.11
    2-octanol 38.3
    2-hexanone 77.74
    octyl acetate 45.43
    limonene 21.99
    1,2-dimethoxyethane 538.9
    ethyl orthosilicate 33.8
    tributyl phosphate 35.56
    diacetone alcohol 126.84
    N,N-dimethylaniline 91.95
    acrylonitrile 169.25
    aniline 83.19
    1,3-propanediol 318.42
    bromobenzene 15.86
    dibromomethane 41.81
    1,1,2,2-tetrachloroethane 68.71
    2-methyl-cyclohexyl acetate 35.2
    tetrabutyl urea 69.48
    diisobutyl methanol 26.05
    2-phenylethanol 55.91
    styrene 24.57
    dioctyl adipate 52.58
    dimethyl sulfate 271.03
    ethyl butyrate 48.72
    methyl lactate 168.4
    butyl lactate 61.83
    diethyl carbonate 39.98
    propanediol butyl ether 138.15
    triethyl orthoformate 44.78
    p-tert-butyltoluene 16.65
    methyl 4-tert-butylbenzoate 81.81
    morpholine 377.85
    tert-butylamine 126.7
    n-dodecanol 38.55
    dimethoxymethane 646.32
    ethylene carbonate 97.53
    cyrene 139.41
    2-ethoxyethyl acetate 71.74
    2-ethylhexyl acetate 27.12
    1,2,4-trichlorobenzene 28.8
    4-methylpyridine 126.62
    dibutyl ether 43.77
    2,6-dimethyl-4-heptanol 26.05
    DEF 250.33
    dimethyl isosorbide 150.58
    tetrachloroethylene 52.94
    eugenol 109.11
    triacetin 72.85
    span 80 104.45
    1,4-butanediol 178.66
    1,1-dichloroethane 48.6
    2-methyl-1-pentanol 72.12
    methyl formate 532.59
    2-methyl-1-butanol 102.54
    n-decane 8.37
    butyronitrile 97.94
    3,7-dimethyl-1-octanol 37.6
    1-chlorooctane 20.22
    1-chlorotetradecane 12.94
    n-nonane 8.1
    undecane 7.16
    tert-butylcyclohexane 6.24
    cyclooctane 9.59
    cyclopentanol 142.1
    tetrahydropyran 147.47
    tert-amyl methyl ether 80.44
    2,5,8-trioxanonane 269.88
    1-hexene 27.58
    2-isopropoxyethanol 188.76
    2,2,2-trifluoroethanol 182.44
    methyl butyrate 90.6

    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