Sodium Thiosulfate

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  • Identifiers

    CAS number
    7772-98-7

    Molecular formula
    Na2O3S2

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

    Safety labels

  • Odor profile

    Fragrance
    Odorless 85.45%
    Sulfurous 21.42%
    Pungent 20.46%
    Savory 17.19%
    Cooked 17.13%
    Garlic 15.6%
    Onion 14.93%
    Fresh 13.51%
    Alliaceous 12.5%
    Roasted 11.8%

     

    Flavor
    Bitter 59.17%
    Odorless 38.57%
    Bland 22.31%
    Sulfur 21.98%
    Formyl 20.51%
    Mustard 20.39%
    Nitrile 20.32%
    Rotten 19.85%
    Mousy 19.23%
    Bread crust 18.61%

     

    Odor impact est.
    High

  • Properties

    pKa est.
    0.11 (strong acid)

    Molecular weight
    158.11 g/mol

    Melting point expt.

    • 48.5 °C

    Flash point

    • 64.67 ˚C est.

    Solubility expt.

    • PRACTICALLY INSOL IN ALCOHOL
    • 50 G SOL IN 100 CC WATER; 231 G @ 100 °C
    • Solubility in water, g/100ml at 20 °C: 20.9

  • Synonyms

    • SODIUM THIOSULFATE
    • 7772-98-7
    • Sodium thiosulphate
    • Disodium thiosulfate
    • Sodothiol
    • Hypo
    • Chlorine Control
    • Chlorine Cure
    • Sodium thiosulfate, anhydrous
    • Thiosulfuric acid, disodium salt
    • Sodium thiosulfate (Na2S2O3)
    • Sodium thiosulphate (Na2S2O3)
    • Sodium oxide sulfide (Na2S2O3)
    • L0IYT1O31N
    • Thiosulfuric acid (H2S2O3), disodium salt
    • Ins no.539
    • Ins-539
    • Sodium thiosulphate, anhydrous
    • DTXSID9042417
    • CHEBI:132112
    • E-539
    • sulfothiorine
    • RefChem:6498
    • Cyanide Antidote Package
    • DTXCID7022417
    • Thiosulfate, Sodium, Pentahydrate
    • Sodium Nitrite and Sodium Thiosulfate
    • 231-867-5
    • Ametox
    • Db-020
    • HX1032V43M
    • Natrii thiosulfas
    • NSC-45624
    • NSC45624
    • PEDMARK
    • S-Hydril
    • Sodium hyposulfite
    • Sodium Thiosulfate Anhydrous
    • Sodium thiosulphate anhydrous
    • Thiosulfuric Acid Disodium Salt
    • Thiosulfuric acid, disodium salt, pentahydrate
    • sodiumthiosulfate
    • disodium sulfurothioate
    • Na2O3S2
    • MFCD00003499
    • Na2S2O3
    • Sodothiol; Sulfactol; Sulfothiorine
    • Declor-It
    • Hypo (VAN)
    • HSDB 592
    • EINECS 231-867-5
    • UNII-L0IYT1O31N
    • AI3-01237
    • sodium thiosulfat
    • sodium thio-sulfate
    • Sodium thiosulfate
    • Sodium oxide sulfide
    • Hypo alcohol, in ethanol
    • anhydrous sodium thiosulfate
    • EC 231-867-5
    • DISODIUM THIOSULPHATE
    • SCHEMBL4087
    • SCHEMBL4088
    • sodium thiosulfate (anhydrous)
    • orb2942229
    • SODIUM THIOSULFATE [MI]
    • CHEMBL3753202
    • SODIUM THIOSULFATE [HSDB]
    • Sodium thiosulfate, AR, >=98%
    • Sodium thiosulfate, LR, >=97%
    • SODIUM THIOSULFATE [WHO-DD]
    • Sodium thiosulfate, p.a., 98.0%
    • AKOS015856704
    • AKOS016372312
    • SODIUM THIOSULFATE ANHYDROUS [II]
    • BP-21059
    • Sodium thiosulfate, ReagentPlus(R), 99%
    • O0522
    • D78333
    • Sodium thiosulfate solution 0.1mol/L (N/10)
    • Sodium thiosulfate, SAJ first grade, >=90.0%
    • disodium;dioxido-oxo-sulfanylidene-lambda6-sulfane
    • F075217
    • Q339866
    • Sodium thiosulfate, >=99.99% trace metals basis
    • Sodium thiosulfate, Vetec(TM) reagent grade, 99%
    • Thiosulfuric acid (H2S2O3), sodium salt (1:2)
    • Sodium thiosulfate solution (2 g/dL in deionized water)
    • Sodium thiosulfate, anhydrous, Trace metals grade 99.99%
    • Sodium thiosulfate, purum p.a., anhydrous, >=98.0% (RT)
    • Analytical Volumetric Solution Sodium Thiosulfate Solution 0.1M
    • Reagecon Sodium Thiosulfate 0.1M according to Japanese Pharmacopoeia
    • USP Solution Sodium Thiosulfate 0.100 Normal (N/10) Conforms to USP
    • European Pharmacopoeia Reagent 0.1M Sodium Thiosulphate-Naturally short expiry
    • Reagecon Sodium Thiosulfate 0.05M Solution according to Chinese Pharmacopoeia (ChP)
    • 7772-98-7

  • Applications

    Sodium Thiosulfate has several primary applications across industries: as a reducing and dechlorinating agent in industrial and municipal water treatment, swimming pool water, and process effluents prior to reuse; as a fixer for silver halide emulsions in traditional photography; in mining and hydrometallurgy for gold leaching, often explored as an alternative to cyanide; in the pulp and paper industry for dechlorination of bleaching effluents; and as a reducing agent in industrial cleaners and processing streams to decompose residual oxidants and stabilize formulations.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 391.87
    methanol 682.65
    isopropanol 281.84
    water 232.19
    ethyl acetate 193.34
    n-propanol 245.06
    acetone 582.61
    n-butanol 199.33
    acetonitrile 366.67
    DMF 1606.22
    toluene 75.56
    isobutanol 150.09
    1,4-dioxane 450.47
    methyl acetate 259.77
    THF 557.47
    2-butanone 323.96
    n-pentanol 146.98
    sec-butanol 234.13
    n-hexane 39.27
    ethylene glycol 401.87
    NMP 803.69
    cyclohexane 87.68
    DMSO 1844.58
    n-butyl acetate 87.07
    n-octanol 111.52
    chloroform 150.42
    n-propyl acetate 120.64
    acetic acid 263.65
    dichloromethane 220.47
    cyclohexanone 265.2
    propylene glycol 186.18
    isopropyl acetate 128.26
    DMAc 1016.59
    2-ethoxyethanol 407.11
    isopentanol 146.46
    n-heptane 51.61
    ethyl formate 164.46
    1,2-dichloroethane 234.78
    n-hexanol 102.67
    2-methoxyethanol 801.67
    isobutyl acetate 59.82
    tetrachloromethane 52.87
    n-pentyl acetate 82.63
    transcutol 473.2
    n-heptanol 77.27
    ethylbenzene 48.5
    MIBK 150.99
    2-propoxyethanol 240.77
    tert-butanol 294.41
    MTBE 229.92
    2-butoxyethanol 140.47
    propionic acid 142.42
    o-xylene 86.65
    formic acid 353.4
    diethyl ether 339.48
    m-xylene 65.36
    p-xylene 52.97
    chlorobenzene 61.32
    dimethyl carbonate 195.81
    n-octane 26.78
    formamide 636.74
    cyclopentanone 343.95
    2-pentanone 265.29
    anisole 149.0
    cyclopentyl methyl ether 263.26
    gamma-butyrolactone 312.74
    1-methoxy-2-propanol 480.91
    pyridine 217.99
    3-pentanone 247.64
    furfural 306.48
    n-dodecane 22.03
    diethylene glycol 364.0
    diisopropyl ether 111.96
    tert-amyl alcohol 240.6
    acetylacetone 289.16
    n-hexadecane 23.74
    acetophenone 139.24
    methyl propionate 240.76
    isopentyl acetate 69.13
    trichloroethylene 203.95
    n-nonanol 99.71
    cyclohexanol 188.58
    benzyl alcohol 122.91
    2-ethylhexanol 69.41
    isooctanol 57.06
    dipropyl ether 142.97
    1,2-dichlorobenzene 63.43
    ethyl lactate 100.36
    propylene carbonate 123.61
    n-methylformamide 585.79
    2-pentanol 177.39
    n-pentane 83.77
    1-propoxy-2-propanol 169.34
    1-methoxy-2-propyl acetate 125.88
    2-(2-methoxypropoxy) propanol 165.79
    mesitylene 57.61
    ε-caprolactone 183.26
    p-cymene 45.92
    epichlorohydrin 310.06
    1,1,1-trichloroethane 110.68
    2-aminoethanol 338.56
    morpholine-4-carbaldehyde 683.15
    sulfolane 484.74
    2,2,4-trimethylpentane 26.53
    2-methyltetrahydrofuran 296.44
    n-hexyl acetate 106.34
    isooctane 19.37
    2-(2-butoxyethoxy)ethanol 204.08
    sec-butyl acetate 81.19
    tert-butyl acetate 139.17
    decalin 23.1
    glycerin 352.09
    diglyme 381.21
    acrylic acid 152.46
    isopropyl myristate 67.1
    n-butyric acid 137.49
    acetyl acetate 114.13
    di(2-ethylhexyl) phthalate 52.39
    ethyl propionate 123.64
    nitromethane 568.68
    1,2-diethoxyethane 189.66
    benzonitrile 98.31
    trioctyl phosphate 46.85
    1-bromopropane 141.35
    gamma-valerolactone 392.16
    n-decanol 82.78
    triethyl phosphate 64.4
    4-methyl-2-pentanol 93.48
    propionitrile 209.55
    vinylene carbonate 113.43
    1,1,2-trichlorotrifluoroethane 275.61
    DMS 98.98
    cumene 36.94
    2-octanol 70.83
    2-hexanone 149.49
    octyl acetate 80.7
    limonene 76.23
    1,2-dimethoxyethane 576.43
    ethyl orthosilicate 62.95
    tributyl phosphate 50.91
    diacetone alcohol 205.72
    N,N-dimethylaniline 150.3
    acrylonitrile 241.99
    aniline 123.22
    1,3-propanediol 337.12
    bromobenzene 50.46
    dibromomethane 166.67
    1,1,2,2-tetrachloroethane 200.12
    2-methyl-cyclohexyl acetate 68.93
    tetrabutyl urea 100.84
    diisobutyl methanol 61.59
    2-phenylethanol 92.11
    styrene 62.07
    dioctyl adipate 81.93
    dimethyl sulfate 328.36
    ethyl butyrate 93.81
    methyl lactate 201.12
    butyl lactate 71.72
    diethyl carbonate 66.55
    propanediol butyl ether 141.49
    triethyl orthoformate 78.03
    p-tert-butyltoluene 49.95
    methyl 4-tert-butylbenzoate 125.02
    morpholine 484.42
    tert-butylamine 188.08
    n-dodecanol 70.93
    dimethoxymethane 771.33
    ethylene carbonate 99.88
    cyrene 176.96
    2-ethoxyethyl acetate 109.43
    2-ethylhexyl acetate 58.44
    1,2,4-trichlorobenzene 74.59
    4-methylpyridine 180.06
    dibutyl ether 107.93
    2,6-dimethyl-4-heptanol 61.59
    DEF 448.39
    dimethyl isosorbide 221.28
    tetrachloroethylene 170.0
    eugenol 133.36
    triacetin 110.53
    span 80 122.11
    1,4-butanediol 172.9
    1,1-dichloroethane 145.59
    2-methyl-1-pentanol 101.28
    methyl formate 420.07
    2-methyl-1-butanol 144.22
    n-decane 32.56
    butyronitrile 159.85
    3,7-dimethyl-1-octanol 84.64
    1-chlorooctane 69.51
    1-chlorotetradecane 37.5
    n-nonane 33.24
    undecane 26.1
    tert-butylcyclohexane 17.5
    cyclooctane 43.71
    cyclopentanol 220.96
    tetrahydropyran 279.76
    tert-amyl methyl ether 203.72
    2,5,8-trioxanonane 309.65
    1-hexene 68.95
    2-isopropoxyethanol 241.73
    2,2,2-trifluoroethanol 191.12
    methyl butyrate 154.21

    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