Gold

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  • Identifiers

    CAS number
    7440-57-5

    Molecular formula
    Au

    SMILES
    [Au]

    Safety labels

  • Odor profile

  • Properties

    pKa est.
    -156.23 (strong acid)

    Molecular weight
    196.96657 g/mol

    Melting point expt.

    • 1064.76 deg C

    Boiling point

    • 2700 deg C

    Flash point

    • 141.57 ˚C est.

    Solubility expt.

    • INSOL IN WATER, ACID; SOL IN POTASSIUM CYANIDE, HOT SULFURIC ACID
    • Soluble in aqua regia, insoluble in acids
    • Dissolves readily in 3:1 hydrochloric-nitric acid to form HAuCl4; dissolves in cyanide solutions in the presence of air or hydrogen peroxide to form Au(CN)2

  • Synonyms

    • GOLD
    • 7440-57-5
    • Gold powder
    • Colloidal gold
    • Gold flake
    • Gold leaf
    • Gold, colloidal
    • Gold, elemental
    • Shell Gold
    • Burnish gold
    • Magnesium gold purple
    • Aurum Metallicum
    • CI 77480
    • 79Y1949PYO
    • C.I. 77480
    • AU
    • Gold (e 175)
    • INS NO.175
    • CHEBI:29287
    • CHEBI:30050
    • INS-175
    • E-175
    • CHEBI:52454
    • Aurum Met
    • NHS Insomnia
    • Aurum 5
    • Aurum 6
    • Aurum 6X
    • Aurum 8X
    • Aurum Metallicum 6X
    • Aurum 10X
    • Aurum 12X
    • Aurum 15X
    • Aurum 20
    • Aurum 20X
    • Aurum 21X
    • Aurum 30
    • Aurum 30X
    • Aurum Metallicum 30X
    • RefChem:5869
    • Aurum 6 Special Order
    • Aurum metallicum 200C
    • Aurum 21X Special Order
    • Bestmade Natural Products Aurum Met
    • Aurum 5X Lavender 0.3 Rose 0.3
    • SuperLighteningBasedonGold24kandKojicAcidSOAP
    • Ginseng Gold Polypeptide Antiwrinkle Anti wrinkle essence
    • 231-165-9
    • gold atom
    • Gold foil
    • Gold wire
    • Gold Ore
    • auride(1-)
    • MFCD00003436
    • Gold shot
    • Gold AA Standard: Au @ 1000 microg/mL in 20% HCl
    • Gold Stabilizer for Mercury: Au @ 100 microg/mL in 5% HCl
    • Gold wire, 1.0mm (0.04in) dia
    • Gold wire, 0.25mm (0.01in) dia
    • Au2
    • Gold wire, 0.5mm (0.02in) dia, Premion?
    • Gold wire, 1.0mm (0.04in) dia, Premion?
    • Gold wire, 2.0mm (0.08in) dia, Premion?
    • Gold, ion(Au4+)
    • HSDB 2125
    • Gold wire, 0.25mm (0.01in) dia, Premion?
    • Gold, ion(2 )
    • Gold(4+)
    • Colloidal gold; Gold powder; Gold flake; Gold leaf
    • Gold Standard: Au @ 1000 microg/mL in 20% HCl
    • EINECS 231-165-9
    • Gold Standard: Au @ 10000 microg/mL in 20% HCl
    • Gold coated mica, layer thickness 2000 ??, 99.999% (Au)
    • Gold, wire, 0.025 mm diameter, length 1 m, purity 99.99+%
    • Gold, wire, 0.05 mm diameter, length 20 m, purity 99.99+%
    • Gold, wire, 0.05 mm diameter, length 5 m, purity 99.99+%
    • gold nanorod
    • Gold nanostar
    • gold shell
    • Gold splatter
    • UNII-79Y1949PYO
    • Gold Dispersion
    • Gold element
    • Gold hydride
    • Gold Microrods
    • Gold Nanocubes
    • Gold Nanopowder
    • Gold Nanoprisms
    • Gold Nanostars
    • Gold Nanotubes
    • Gold Nanowires
    • Element Gold
    • Element:Gold
    • Gold Nanorods
    • Gold Nanowire
    • Gold Pellets
    • Gold, foil, thickness 0.004 mm, size 25 x 25 mm, purity 99.9%
    • Gold, foil, thickness 0.004 mm, size 50 x 50 mm, purity 99.9%
    • Gold, foil, thickness 0.005 mm, size 25 x 25 mm, purity 99.9%
    • Gold, foil, thickness 0.005 mm, size 50 x 50 mm, purity 99.9%
    • Gold, foil, thickness 0.006 mm, size 25 x 25 mm, purity 99.9%
    • Gold, foil, thickness 0.007 mm, size 25 x 25 mm, purity 99.9%
    • Gold, foil, thickness 0.007 mm, size 50 x 50 mm, purity 99.9%
    • Gold, foil, thickness 0.008 mm, size 25 x 25 mm, purity 99.9%
    • Gold, foil, thickness 0.008 mm, size 50 x 50 mm, purity 99.9%
    • Gold, foil, thickness 0.009 mm, size 25 x 25 mm, purity 99.9%
    • Gold, foil, thickness 0.009 mm, size 50 x 50 mm, purity 99.9%
    • Gold, foil, thickness 0.01 mm, size 25 x 25 mm, purity 99.9%
    • Gold, foil, thickness 0.015 mm, size 25 x 25 mm, purity 99.9%
    • Gold, foil, thickness 0.015 mm, size 50 x 50 mm, purity 99.9%
    • Gold, foil, thickness 0.02 mm, size 50 x 50 mm, purity 99.9%
    • Gold, wire, 0.025 mm diameter, length 10 m, purity 99.99+%
    • Gold, wire, 0.025 mm diameter, length 100 m, purity 99.99+%
    • Gold, wire, 0.025 mm diameter, length 20 m, purity 99.99+%
    • Gold, wire, 0.025 mm diameter, length 50 m, purity 99.99+%
    • Atomic Gold
    • Element-Au
    • Element:Au
    • DTXSID3064697
    • Gold nanorods, 25 nm diameter, absorption, 550 nm, dispersion in H2O
    • Gold nanorods, 25 nm diameter, absorption, 600 nm, dispersion in H2O
    • Gold nanorods, 25 nm diameter, absorption, 650 nm, dispersion in H2O
    • Gold, foil, thickness 0.0125 mm, size 100 x 100 mm, purity 99.9%
    • Gold, foil, thickness 0.0125 mm, size 25 x 25 mm, purity 99.9%
    • Gold, foil, thickness 0.0125 mm, size 50 x 50 mm, purity 99.9%
    • Gold, foil, thickness 0.015 mm, size 100 x 100 mm, purity 99.9%
    • Gold, foil, thickness 0.02 mm, size 100 x 100 mm, purity 99.9%
    • 7440-57-5

  • Applications

    Gold (CAS 7440-57-5) is widely used in electronics for high-reliability components, including electroplated connectors and contacts, gold bonding wires, and thin-film coatings, as well as conductive inks for printed electronics. It also serves as a versatile catalyst in fine-chemical and petrochemical manufacturing when supported on suitable carriers. In dentistry, gold alloys are used for crowns and restorations due to their biocompatibility and workability. In jewelry and decorative coatings, gold is applied as foil, leaf, or thin coatings for aesthetic and corrosion-resistant finishes. In nanotechnology, gold nanoparticles are employed in biosensing, imaging, and analytical platforms because of their tunable surface chemistry and optical properties.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 407.79
    methanol 498.42
    isopropanol 289.85
    water 13.16
    ethyl acetate 291.47
    n-propanol 281.55
    acetone 635.61
    n-butanol 260.35
    acetonitrile 366.41
    DMF 1270.36
    toluene 172.18
    isobutanol 202.15
    1,4-dioxane 713.9
    methyl acetate 347.24
    THF 757.93
    2-butanone 400.03
    n-pentanol 206.72
    sec-butanol 245.06
    n-hexane 55.5
    ethylene glycol 205.33
    NMP 1050.47
    cyclohexane 82.45
    DMSO 1049.47
    n-butyl acetate 238.54
    n-octanol 183.34
    chloroform 440.97
    n-propyl acetate 211.48
    acetic acid 470.52
    dichloromethane 399.65
    cyclohexanone 518.44
    propylene glycol 161.46
    isopropyl acetate 193.39
    DMAc 855.79
    2-ethoxyethanol 376.46
    isopentanol 216.29
    n-heptane 59.43
    ethyl formate 217.54
    1,2-dichloroethane 311.65
    n-hexanol 237.94
    2-methoxyethanol 605.8
    isobutyl acetate 145.97
    tetrachloromethane 123.26
    n-pentyl acetate 196.42
    transcutol 1059.01
    n-heptanol 159.26
    ethylbenzene 103.62
    MIBK 223.31
    2-propoxyethanol 415.27
    tert-butanol 350.52
    MTBE 303.32
    2-butoxyethanol 287.82
    propionic acid 286.8
    o-xylene 153.14
    formic acid 202.83
    diethyl ether 336.66
    m-xylene 137.94
    p-xylene 137.19
    chlorobenzene 227.13
    dimethyl carbonate 192.35
    n-octane 32.71
    formamide 295.18
    cyclopentanone 668.19
    2-pentanone 343.99
    anisole 268.81
    cyclopentyl methyl ether 377.45
    gamma-butyrolactone 662.97
    1-methoxy-2-propanol 442.37
    pyridine 410.82
    3-pentanone 282.27
    furfural 578.47
    n-dodecane 32.12
    diethylene glycol 429.13
    diisopropyl ether 136.51
    tert-amyl alcohol 289.29
    acetylacetone 425.45
    n-hexadecane 35.36
    acetophenone 260.93
    methyl propionate 278.09
    isopentyl acetate 210.55
    trichloroethylene 510.72
    n-nonanol 158.07
    cyclohexanol 263.27
    benzyl alcohol 210.68
    2-ethylhexanol 163.4
    isooctanol 130.76
    dipropyl ether 202.4
    1,2-dichlorobenzene 223.1
    ethyl lactate 146.3
    propylene carbonate 333.7
    n-methylformamide 398.5
    2-pentanol 207.47
    n-pentane 68.11
    1-propoxy-2-propanol 309.93
    1-methoxy-2-propyl acetate 266.54
    2-(2-methoxypropoxy) propanol 308.89
    mesitylene 106.52
    ε-caprolactone 406.47
    p-cymene 96.99
    epichlorohydrin 500.34
    1,1,1-trichloroethane 307.61
    2-aminoethanol 243.2
    morpholine-4-carbaldehyde 874.13
    sulfolane 769.0
    2,2,4-trimethylpentane 41.51
    2-methyltetrahydrofuran 512.32
    n-hexyl acetate 256.47
    isooctane 32.88
    2-(2-butoxyethoxy)ethanol 407.52
    sec-butyl acetate 157.41
    tert-butyl acetate 245.92
    decalin 50.36
    glycerin 276.29
    diglyme 710.48
    acrylic acid 301.59
    isopropyl myristate 133.57
    n-butyric acid 281.94
    acetyl acetate 235.12
    di(2-ethylhexyl) phthalate 129.16
    ethyl propionate 188.21
    nitromethane 682.98
    1,2-diethoxyethane 352.12
    benzonitrile 251.5
    trioctyl phosphate 103.82
    1-bromopropane 199.09
    gamma-valerolactone 701.88
    n-decanol 128.66
    triethyl phosphate 124.36
    4-methyl-2-pentanol 139.49
    propionitrile 239.55
    vinylene carbonate 294.21
    1,1,2-trichlorotrifluoroethane 429.7
    DMS 239.01
    cumene 84.0
    2-octanol 128.19
    2-hexanone 242.18
    octyl acetate 163.87
    limonene 151.0
    1,2-dimethoxyethane 599.6
    ethyl orthosilicate 124.21
    tributyl phosphate 120.13
    diacetone alcohol 321.76
    N,N-dimethylaniline 214.89
    acrylonitrile 315.89
    aniline 214.08
    1,3-propanediol 313.31
    bromobenzene 218.9
    dibromomethane 289.16
    1,1,2,2-tetrachloroethane 399.28
    2-methyl-cyclohexyl acetate 166.93
    tetrabutyl urea 178.95
    diisobutyl methanol 119.12
    2-phenylethanol 214.72
    styrene 136.44
    dioctyl adipate 180.63
    dimethyl sulfate 346.1
    ethyl butyrate 185.47
    methyl lactate 211.3
    butyl lactate 165.11
    diethyl carbonate 141.56
    propanediol butyl ether 282.3
    triethyl orthoformate 154.72
    p-tert-butyltoluene 98.74
    methyl 4-tert-butylbenzoate 252.08
    morpholine 651.49
    tert-butylamine 232.61
    n-dodecanol 110.13
    dimethoxymethane 551.09
    ethylene carbonate 238.41
    cyrene 303.45
    2-ethoxyethyl acetate 281.54
    2-ethylhexyl acetate 179.98
    1,2,4-trichlorobenzene 267.87
    4-methylpyridine 390.89
    dibutyl ether 199.11
    2,6-dimethyl-4-heptanol 119.12
    DEF 465.21
    dimethyl isosorbide 454.58
    tetrachloroethylene 295.69
    eugenol 264.94
    triacetin 278.41
    span 80 281.23
    1,4-butanediol 163.47
    1,1-dichloroethane 290.0
    2-methyl-1-pentanol 179.71
    methyl formate 323.05
    2-methyl-1-butanol 203.5
    n-decane 45.34
    butyronitrile 224.33
    3,7-dimethyl-1-octanol 157.8
    1-chlorooctane 126.7
    1-chlorotetradecane 68.35
    n-nonane 45.44
    undecane 36.93
    tert-butylcyclohexane 48.18
    cyclooctane 36.38
    cyclopentanol 321.19
    tetrahydropyran 474.94
    tert-amyl methyl ether 254.68
    2,5,8-trioxanonane 537.82
    1-hexene 132.08
    2-isopropoxyethanol 269.22
    2,2,2-trifluoroethanol 198.83
    methyl butyrate 239.73

    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