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Sodium diacetate

Sodium diacetate
NaDiacetate.png
Sodium diacetate
Names
Other names
Sodium hydrogen acetate; Sodium acid acetate
Identifiers
126-96-5 YesY
3D model (Jmol) Interactive image
ChemSpider 29100
ECHA InfoCard 100.004.378
UNII 26WJH3CS0B YesY
Properties
C4H7NaO4
Molar mass 142.09 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Sodium diacetate is a compound with formula NaH(C
2
H
3
O
2
)
2
. It is a salt of acetic acid. It is a colorless solid that is used in seasonings and as an antimicrobial agent.

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, is best described as the sodium salt of the hydrogen-bonded anion (CH3CO2)2H. The O---O distance is about 2.47 Å. The species has no significant existence in solution but forms stable crystals.

As a food additive, it has E number E262 and is used to impart a salt and vinegar flavor.


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