Disodium Pyrophosphate

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  • Identifiers

    CAS number
    7758-16-9

    Molecular formula
    H2Na2O7P2

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

    Safety labels

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Odorless 77.04%
    Clean 18.11%
    Sour 15.59%
    Fresh 12.7%
    Alcoholic 12.69%
    Sharp 12.44%
    Green 12.17%
    Balsamic 12.14%
    Savory 11.85%
    Ethereal 11.83%

     

    Flavor
    Odorless 67.21%
    Sour 33.84%
    Bland 23.02%
    Vinegar 22.56%
    Mild 22.23%
    Very mild 20.28%
    Yeast 20.03%
    Formyl 19.69%
    Soy 19.0%
    Mousy 18.63%

     

    Odor impact est.
    Low

  • Properties

    pKa est.
    1.99 (strong acid)

    Molecular weight
    221.94 g/mol

    Flash point

    • 254.33 ˚C est.

    Solubility expt.

    • Soluble in water
    • Sol in water

  • Synonyms

    • 7758-16-9
    • Sodium acid pyrophosphate
    • Disodium dihydrogen pyrophosphate
    • DISODIUM PYROPHOSPHATE
    • Disodium dihydrogen diphosphate
    • Diphosphoric acid, disodium salt
    • Disodium acid pyrophosphate
    • Dinatriumpyrophosphat
    • H5WVD9LZUD
    • Pyrophosphoric acid, disodium salt
    • RefChem:135083
    • 231-835-0
    • SAPP
    • MFCD00014246
    • Disodiumpytophosphate
    • Dinatriumpyrophosphat [German]
    • HSDB 377
    • UNII-H5WVD9LZUD
    • Sodium pyrophosphate (Na2H2P2O7)
    • EINECS 231-835-0
    • Sodium diphosphate dibasic
    • disodium hydrogen (hydrogen phosphonatooxy)phosphonate
    • Grahamsches salz
    • Disodium Diphosphate; Pyrophosphoric Acid Disodium Salt; Diphosphoric Acid Disodium Salt; Disodium Pyrophosphate; Disodium Acid Pyrophosphate;
    • Glassy sodium phosphate
    • DSSTox_CID_8842
    • UNII-P1BM4ZH95L
    • EC 231-835-0
    • DSSTox_RID_78658
    • DSSTox_GSID_28842
    • Sodium pyrophosphate, dibasic
    • SCHEMBL118120
    • CHEMBL3184949
    • EINECS 272-808-3
    • Tox21_200813
    • DISODIUM PYROPHOSPHATE [HSDB]
    • DISODIUM PYROPHOSPHATE [VANDF]
    • AKOS015916169
    • AKOS024418779
    • SODIUM ACID PYROPHOSPHATE [MI]
    • Diphosphoric acid, sodium salt (1:2)
    • FS45566
    • SODIUM ACID PYROPHOSPHATE [FCC]
    • NCGC00258367-01
    • SODIUM ACID PYROPHOSPHATE [VANDF]
    • CAS-68915-31-1
    • di-sodium dihydrogen pyrophosphate anhydrous
    • 7758-16-9

  • Applications

    Disodium Pyrophosphate (CAS 7758-16-9) is commonly used in food processing as a buffering agent, sequestrant, and leavening aid; in detergents and household cleaners as a water-softening builder; in cosmetics and personal care products as a chelating and pH-stabilizing ingredient; in toothpaste as a tartar-control agent; and in industrial process water treatment to inhibit scale formation and improve water quality.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 281.0
    methanol 510.55
    isopropanol 241.27
    water 747.08
    ethyl acetate 83.48
    n-propanol 174.49
    acetone 339.92
    n-butanol 136.6
    acetonitrile 117.8
    DMF 1093.64
    toluene 21.57
    isobutanol 104.43
    1,4-dioxane 159.19
    methyl acetate 91.62
    THF 477.88
    2-butanone 135.63
    n-pentanol 82.3
    sec-butanol 125.57
    n-hexane 8.66
    ethylene glycol 405.36
    NMP 514.06
    cyclohexane 8.23
    DMSO 1190.88
    n-butyl acetate 48.86
    n-octanol 41.59
    chloroform 24.84
    n-propyl acetate 64.82
    acetic acid 162.86
    dichloromethane 37.33
    cyclohexanone 104.96
    propylene glycol 336.2
    isopropyl acetate 75.22
    DMAc 538.39
    2-ethoxyethanol 344.35
    isopentanol 89.9
    n-heptane 10.17
    ethyl formate 114.09
    1,2-dichloroethane 47.37
    n-hexanol 71.3
    2-methoxyethanol 699.48
    isobutyl acetate 30.19
    tetrachloromethane 10.27
    n-pentyl acetate 40.94
    transcutol 263.47
    n-heptanol 47.12
    ethylbenzene 9.96
    MIBK 103.96
    2-propoxyethanol 328.34
    tert-butanol 215.82
    MTBE 71.25
    2-butoxyethanol 155.27
    propionic acid 118.7
    o-xylene 20.88
    formic acid 306.73
    diethyl ether 114.6
    m-xylene 25.03
    p-xylene 11.73
    chlorobenzene 11.33
    dimethyl carbonate 166.38
    n-octane 4.72
    formamide 516.65
    cyclopentanone 262.65
    2-pentanone 165.26
    anisole 42.8
    cyclopentyl methyl ether 149.6
    gamma-butyrolactone 273.33
    1-methoxy-2-propanol 629.07
    pyridine 62.51
    3-pentanone 98.82
    furfural 205.66
    n-dodecane 3.48
    diethylene glycol 435.17
    diisopropyl ether 37.83
    tert-amyl alcohol 114.58
    acetylacetone 190.42
    n-hexadecane 3.77
    acetophenone 50.48
    methyl propionate 134.37
    isopentyl acetate 32.7
    trichloroethylene 38.82
    n-nonanol 39.33
    cyclohexanol 73.63
    benzyl alcohol 58.59
    2-ethylhexanol 29.1
    isooctanol 30.2
    dipropyl ether 66.26
    1,2-dichlorobenzene 11.66
    ethyl lactate 117.44
    propylene carbonate 120.48
    n-methylformamide 489.04
    2-pentanol 108.03
    n-pentane 14.5
    1-propoxy-2-propanol 222.66
    1-methoxy-2-propyl acetate 117.28
    2-(2-methoxypropoxy) propanol 128.21
    mesitylene 20.6
    ε-caprolactone 93.54
    p-cymene 10.86
    epichlorohydrin 201.61
    1,1,1-trichloroethane 22.85
    2-aminoethanol 391.43
    morpholine-4-carbaldehyde 403.19
    sulfolane 430.98
    2,2,4-trimethylpentane 4.89
    2-methyltetrahydrofuran 154.31
    n-hexyl acetate 43.84
    isooctane 5.43
    2-(2-butoxyethoxy)ethanol 171.43
    sec-butyl acetate 38.61
    tert-butyl acetate 86.7
    decalin 3.71
    glycerin 551.84
    diglyme 236.7
    acrylic acid 128.1
    isopropyl myristate 25.79
    n-butyric acid 117.26
    acetyl acetate 49.69
    di(2-ethylhexyl) phthalate 24.13
    ethyl propionate 72.53
    nitromethane 303.71
    1,2-diethoxyethane 74.24
    benzonitrile 31.91
    trioctyl phosphate 27.68
    1-bromopropane 26.32
    gamma-valerolactone 315.31
    n-decanol 31.64
    triethyl phosphate 32.64
    4-methyl-2-pentanol 60.84
    propionitrile 83.0
    vinylene carbonate 88.3
    1,1,2-trichlorotrifluoroethane 182.76
    DMS 46.89
    cumene 9.44
    2-octanol 33.58
    2-hexanone 74.72
    octyl acetate 32.87
    limonene 15.1
    1,2-dimethoxyethane 330.68
    ethyl orthosilicate 30.26
    tributyl phosphate 27.22
    diacetone alcohol 195.34
    N,N-dimethylaniline 47.84
    acrylonitrile 108.03
    aniline 60.17
    1,3-propanediol 345.57
    bromobenzene 7.5
    dibromomethane 23.38
    1,1,2,2-tetrachloroethane 47.16
    2-methyl-cyclohexyl acetate 31.16
    tetrabutyl urea 48.4
    diisobutyl methanol 26.62
    2-phenylethanol 51.41
    styrene 10.22
    dioctyl adipate 36.73
    dimethyl sulfate 300.57
    ethyl butyrate 51.0
    methyl lactate 269.7
    butyl lactate 72.2
    diethyl carbonate 33.45
    propanediol butyl ether 156.98
    triethyl orthoformate 43.62
    p-tert-butyltoluene 13.85
    methyl 4-tert-butylbenzoate 75.69
    morpholine 244.68
    tert-butylamine 108.24
    n-dodecanol 24.44
    dimethoxymethane 604.07
    ethylene carbonate 84.41
    cyrene 160.31
    2-ethoxyethyl acetate 57.83
    2-ethylhexyl acetate 23.4
    1,2,4-trichlorobenzene 13.83
    4-methylpyridine 62.97
    dibutyl ether 27.5
    2,6-dimethyl-4-heptanol 26.62
    DEF 194.43
    dimethyl isosorbide 183.69
    tetrachloroethylene 31.33
    eugenol 103.06
    triacetin 55.78
    span 80 94.09
    1,4-butanediol 162.61
    1,1-dichloroethane 35.21
    2-methyl-1-pentanol 44.58
    methyl formate 337.59
    2-methyl-1-butanol 77.55
    n-decane 5.22
    butyronitrile 78.83
    3,7-dimethyl-1-octanol 26.77
    1-chlorooctane 12.2
    1-chlorotetradecane 6.89
    n-nonane 5.07
    undecane 4.2
    tert-butylcyclohexane 4.0
    cyclooctane 5.32
    cyclopentanol 152.33
    tetrahydropyran 91.05
    tert-amyl methyl ether 68.73
    2,5,8-trioxanonane 197.91
    1-hexene 17.19
    2-isopropoxyethanol 191.23
    2,2,2-trifluoroethanol 163.01
    methyl butyrate 83.92

    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