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Chemical compound From Wikipedia, the free encyclopedia
Sodium diacetate is a compound with formula NaH(C
2H
3O
2)
2. It is a salt of acetic acid. It is a colorless solid that is used in seasonings and as an antimicrobial agent.
![]() Sodium diacetate | |
Names | |
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IUPAC name
Sodium diacetate | |
Other names
Sodium diacetate (anhydrous); Sodium hydrogen acetate; Sodium acid acetate | |
Identifiers | |
3D model (JSmol) |
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ChemSpider | |
ECHA InfoCard | 100.004.378 |
MeSH | diacetate sodium diacetate |
PubChem CID |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
C4H7NaO4 | |
Molar mass | 142.086 g·mol−1 |
Appearance | White powder |
Odor | Acetic acid (vinegar) odor |
1 g/mL | |
Solubility in alcohol | Slightly |
Solubility in ether | Insoluble |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Inhalation hazards |
Irritant[1] |
Eye hazards |
Irritant[1] |
GHS labelling:[1] | |
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Danger | |
H318, H319 | |
P264, P280, P305+P351+P338, P310, P337+P313 | |
Flash point | >150 °C (302 °F)[1] |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
>2,000 mg/kg (rat, dermal), 5,600 mg/kg (rat, oral) |
Safety data sheet (SDS) | PubChem sodium diacetate LCSS |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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The salt forms upon half-neutralization of acetic acid followed by evaporation of the solution. It can be viewed as the result of homoassociation, an effect that enhances the acidity of acetic acid in concentrated solution:
Also described as the sodium acid salt of acetic acid, it is best described as the sodium salt of the hydrogen-bonded anion (CH3CO2)2H−. The O···O distance is about 2.47 angstrom.[2] The species has no significant existence in solution but forms stable crystals.
As a food additive,[3] it has E number E262 and is used to impart a salt and vinegar flavor.