Sodium diacetate
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| MeSH | diacetate sodium diacetate |
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| Molar mass | Template:Chem molar mass |
| Appearance | White powder |
| Odor | Acetic acid (vinegar) odor |
| Solubility in alcohol | Slightly |
| Solubility in ether | Insoluble |
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Sodium diacetate is a compound with formula Template:Chem/link. It is a salt of acetic acid. It is a colorless solid that is used in seasonings and as an antimicrobial agent.
Preparation and structure
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:
- 2 CH3CO2H + NaOH → Na+[(CH3CO2)2H]− + H2O
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.[1] The species has no significant existence in solution but forms stable crystals.
Applications
As a food additive,[2] it has E number E262 and is used to impart a salt and vinegar flavor.
See also
References
- ↑ Barrow, Michael J.; Currie, Murdoch; Muir, Kenneth W.; Speakman, J. Clare; White, David N, J. "Crystal structures of some acid salts of monobasic acids. XVII. Structure of sodium hydrogen diacetate, redetermined by neutron diffraction" Journal of the Chemical Society, Perkin Transactions 2: Physical Organic Chemistry 1975, pp. 15-18. Script error: No such module "CS1 identifiers".
- ↑ Peter J. Taormina "Implications of Salt and Sodium Reduction on Microbial Food Safety" in Critical Reviews in Food Science and Nutrition, 2010, vol. 50, 209-227. Script error: No such module "CS1 identifiers".