Sodium Hydroxide

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  • Identifiers

    CAS number
    1310-73-2

    Molecular formula
    HNaO

    SMILES
    [OH-].[Na+]

    Safety labels

    Corrosive
    Corrosive

  • Odor profile

    Odor impact est.
    Low

  • Properties

    pKa est.
    -1.37 (strong acid)

    Molecular weight
    39.997 g/mol

    Melting point expt.

    • 604 °F (USCG, 1999)
    • 323
    • 323 °C
    • 318 °C
    • 605 °F

    Boiling point

    • greater than 266 °F at 760 mmHg (USCG, 1999)
    • Very high (USCG, 1999)
    • 1388
    • 1388 °C
    • 2534 °F

    Flash point

    • 48.44 ˚C est.

    Solubility expt.

    • 111 % (NIOSH, 2024)
    • easily soluble in cold water, hot water
    • Very soluble in water. Freely soluble in ethanol
    • 1 g dissolves in 7.2 mL absolute alcohol, 4.2 mL methanol; also soluble in glycerol
    • 1 g dissolves in 0.9 mL water, 0.3 mL boiling water
    • Solubility in water, g/100ml at 20 °C: 109 (very good)
    • 111%

  • Synonyms

    • SODIUM HYDROXIDE
    • 1310-73-2
    • Caustic soda
    • Sodium hydrate
    • Aetznatron
    • Soda lye
    • White caustic
    • Soda, caustic
    • Natriumhydroxid
    • Rohrputz
    • Plung
    • Collo-Grillrein
    • Collo-Tapetta
    • Sodium hydroxide (Na(OH))
    • Fuers Rohr
    • Rohrreiniger Rofix
    • Hydroxyde de sodium
    • Natriumhydroxyde
    • Soda, hydrate
    • Sodium hydroxide dimer
    • Natrium causticum
    • Soda, kaustische
    • Lewis-red devil lye
    • Sodio(idrossido di)
    • Sodium hydroxide (Na2(OH)2)
    • Stamperprep
    • Caustic soda, liquid
    • Sodium(hydroxyde de)
    • Tosoh pearl
    • Promoter 3308b
    • Natrii hydroxydum
    • NSC-135799
    • DTXSID0029634
    • INS-524
    • 55X04QC32I
    • E-524
    • CHEBI:32145
    • Hydroxide, Sodium
    • RefChem:117
    • DTXCID609634
    • 215-185-5
    • Ascarite
    • Liquid-plumr
    • NaOH
    • sodium;hydroxide
    • 81133-20-2
    • Ascarite II
    • Sodium hydroxide, pellets
    • sodiumhydroxide
    • LYE
    • MFCD00003548
    • Sodium hydroxide, flake
    • Sodium hydroxide, solid
    • Soda asbestos
    • Sodium hydroxide; NaOH
    • Na (O H)
    • Caswell No. 773
    • Natriumhydroxid [German]
    • Natriumhydroxyde [Dutch]
    • Natrium-hydroxid, reinstes
    • UN 1823 (solid)
    • Hydroxyde de sodium [French]
    • HSDB 229
    • Sodio(idrossido di) [Italian]
    • Sodium(hydroxyde de) [French]
    • Sodium Hydroxide (0.1M in water (0.1N))
    • Sodium hydroxide [NF]
    • EINECS 215-185-5
    • UN1823
    • EPA Pesticide Chemical Code 075603
    • NSC 135799
    • sodiumhydroxid
    • hydroxyl sodium
    • sodium hydoxide
    • sodium hydroxid
    • sodium hyroxide
    • soude caustique
    • UNII-55X04QC32I
    • hydroxide sodium
    • Caustic soda, dry
    • Caustic soda, bead
    • Caustic soda, flake
    • Caustic soda, solid
    • 1M Sodium hydroxide
    • Sodium hydroxide, dry
    • Sodium hydroxide beads
    • Caustic soda, granular
    • Sodium hydroxide liquid
    • Sodium hydroxide pearls
    • Sodium hydroxide, bead
    • Sodium hydroxide 50%
    • Sodium Hydroxide Flakes
    • Sodium hydroxide, pearl
    • Sodium hydroxide pellets
    • 0.1M Sodium hydroxide
    • Sodium hydroxide (flake)
    • Sodium hydroxide (NaOH)
    • Sodium hydroxide (liquid)
    • SCHEMBL119
    • Sodium hydroxide, granular
    • WLN: NA Q
    • EC 215-185-5
    • Sodium Hdyroxide 4% W/V
    • Sodium hydroxide, anhydrous
    • Sodium Hydroxide 22% W/W
    • SODIUM HYDROXIDE [II]
    • SODIUM HYDROXIDE [MI]
    • Sodium hydroxide (JP18/NF)
    • SODIUM HYDROXIDE [FCC]
    • SODIUM HYDROXIDE [JAN]
    • Sodium hydroxide solution 20%
    • SCHEMBL6650391
    • SODIUM HYDROXIDE [HSDB]
    • Sodium hydroxide solution dilute
    • Sodium hydroxide solution strong
    • CHEMBL2105794
    • SODIUM HYDROXIDE [VANDF]
    • Sodium hydroxide pellets USP-NF
    • SODIUM HYDROXIDE [MART.]
    • SODIUM HYDROXIDE [WHO-DD]
    • SODIUM HYDROXIDE [WHO-IP]
    • Sodium hydroxide, 10wt% solution
    • 0.1M Sodium hydroxide, ethanolic
    • NSC135799
    • Sodium hydroxide pellets ACS reagent
    • AKOS015913904
    • AKOS015951419
    • 1310-73-2

  • Applications

    Sodium Hydroxide (CAS 1310-73-2) is a caustic base used across multiple industries: in soap and detergent manufacture for saponification of fats and oils and for pH adjustment; in pulping and paper production as an alkaline processing aid; in water treatment for pH control and alkalinity management; in textile processing for mercerization and pH control in dyeing; in industrial cleaning and degreasing as a caustic cleaning agent; and in certain food processing steps as a processing aid, such as pretzel browning and olive curing. It is typically handled and used under strict process controls due to its caustic nature.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 146.31
    methanol 314.16
    isopropanol 106.52
    water 325.2
    ethyl acetate 17.09
    n-propanol 85.61
    acetone 76.03
    n-butanol 57.22
    acetonitrile 47.55
    DMF 682.56
    toluene 2.46
    isobutanol 52.02
    1,4-dioxane 72.04
    methyl acetate 33.54
    THF 72.57
    2-butanone 32.06
    n-pentanol 28.56
    sec-butanol 56.76
    n-hexane 1.43
    ethylene glycol 243.16
    NMP 181.13
    cyclohexane 2.02
    DMSO 355.37
    n-butyl acetate 7.58
    n-octanol 11.88
    chloroform 6.37
    n-propyl acetate 9.68
    acetic acid 166.51
    dichloromethane 10.5
    cyclohexanone 25.62
    propylene glycol 148.59
    isopropyl acetate 9.45
    DMAc 285.27
    2-ethoxyethanol 86.83
    isopentanol 37.76
    n-heptane 1.67
    ethyl formate 34.71
    1,2-dichloroethane 11.6
    n-hexanol 17.75
    2-methoxyethanol 212.21
    isobutyl acetate 4.94
    tetrachloromethane 2.35
    n-pentyl acetate 6.95
    transcutol 77.4
    n-heptanol 11.79
    ethylbenzene 1.65
    MIBK 11.69
    2-propoxyethanol 48.81
    tert-butanol 116.03
    MTBE 29.33
    2-butoxyethanol 30.22
    propionic acid 83.43
    o-xylene 3.87
    formic acid 288.34
    diethyl ether 21.05
    m-xylene 2.79
    p-xylene 2.21
    chlorobenzene 3.33
    dimethyl carbonate 30.6
    n-octane 0.75
    formamide 249.41
    cyclopentanone 41.1
    2-pentanone 20.8
    anisole 9.99
    cyclopentyl methyl ether 20.01
    gamma-butyrolactone 62.0
    1-methoxy-2-propanol 117.5
    pyridine 23.75
    3-pentanone 15.35
    furfural 58.53
    n-dodecane 0.77
    diethylene glycol 84.16
    diisopropyl ether 5.04
    tert-amyl alcohol 65.23
    acetylacetone 21.36
    n-hexadecane 0.78
    acetophenone 9.52
    methyl propionate 28.9
    isopentyl acetate 6.08
    trichloroethylene 12.1
    n-nonanol 9.94
    cyclohexanol 28.72
    benzyl alcohol 15.19
    2-ethylhexanol 7.28
    isooctanol 8.27
    dipropyl ether 8.74
    1,2-dichlorobenzene 3.75
    ethyl lactate 15.81
    propylene carbonate 23.06
    n-methylformamide 241.63
    2-pentanol 28.91
    n-pentane 2.69
    1-propoxy-2-propanol 29.29
    1-methoxy-2-propyl acetate 12.82
    2-(2-methoxypropoxy) propanol 26.85
    mesitylene 2.65
    ε-caprolactone 24.69
    p-cymene 2.29
    epichlorohydrin 40.79
    1,1,1-trichloroethane 4.45
    2-aminoethanol 212.07
    morpholine-4-carbaldehyde 170.82
    sulfolane 83.6
    2,2,4-trimethylpentane 1.73
    2-methyltetrahydrofuran 32.92
    n-hexyl acetate 9.78
    isooctane 1.22
    2-(2-butoxyethoxy)ethanol 36.31
    sec-butyl acetate 5.09
    tert-butyl acetate 10.92
    decalin 0.9
    glycerin 212.77
    diglyme 64.58
    acrylic acid 100.38
    isopropyl myristate 4.38
    n-butyric acid 47.75
    acetyl acetate 8.71
    di(2-ethylhexyl) phthalate 6.93
    ethyl propionate 10.05
    nitromethane 164.33
    1,2-diethoxyethane 13.84
    benzonitrile 9.83
    trioctyl phosphate 5.87
    1-bromopropane 5.33
    gamma-valerolactone 73.7
    n-decanol 7.82
    triethyl phosphate 5.71
    4-methyl-2-pentanol 14.14
    propionitrile 29.22
    vinylene carbonate 25.64
    1,1,2-trichlorotrifluoroethane 60.28
    DMS 10.77
    cumene 1.8
    2-octanol 7.42
    2-hexanone 10.18
    octyl acetate 6.84
    limonene 3.89
    1,2-dimethoxyethane 99.84
    ethyl orthosilicate 5.4
    tributyl phosphate 5.77
    diacetone alcohol 30.72
    N,N-dimethylaniline 11.83
    acrylonitrile 49.14
    aniline 13.92
    1,3-propanediol 152.86
    bromobenzene 1.79
    dibromomethane 5.31
    1,1,2,2-tetrachloroethane 11.81
    2-methyl-cyclohexyl acetate 5.4
    tetrabutyl urea 10.88
    diisobutyl methanol 5.3
    2-phenylethanol 9.81
    styrene 2.26
    dioctyl adipate 7.78
    dimethyl sulfate 55.72
    ethyl butyrate 7.16
    methyl lactate 46.25
    butyl lactate 11.27
    diethyl carbonate 5.57
    propanediol butyl ether 35.22
    triethyl orthoformate 6.86
    p-tert-butyltoluene 2.5
    methyl 4-tert-butylbenzoate 14.7
    morpholine 102.39
    tert-butylamine 50.48
    n-dodecanol 6.26
    dimethoxymethane 122.53
    ethylene carbonate 20.78
    cyrene 27.2
    2-ethoxyethyl acetate 11.33
    2-ethylhexyl acetate 4.46
    1,2,4-trichlorobenzene 4.73
    4-methylpyridine 19.63
    dibutyl ether 5.84
    2,6-dimethyl-4-heptanol 5.3
    DEF 62.4
    dimethyl isosorbide 25.49
    tetrachloroethylene 9.86
    eugenol 18.86
    triacetin 12.01
    span 80 22.18
    1,4-butanediol 67.36
    1,1-dichloroethane 7.2
    2-methyl-1-pentanol 18.48
    methyl formate 141.0
    2-methyl-1-butanol 35.71
    n-decane 1.04
    butyronitrile 22.86
    3,7-dimethyl-1-octanol 8.34
    1-chlorooctane 2.84
    1-chlorotetradecane 1.58
    n-nonane 0.99
    undecane 0.87
    tert-butylcyclohexane 0.97
    cyclooctane 0.85
    cyclopentanol 45.22
    tetrahydropyran 30.87
    tert-amyl methyl ether 20.7
    2,5,8-trioxanonane 47.75
    1-hexene 3.55
    2-isopropoxyethanol 39.18
    2,2,2-trifluoroethanol 79.99
    methyl butyrate 16.21

    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