Sodium Diacetate – a chemical compound

Sodium Diacetate – a chemical compound

Sodium diacetate is a chemical compound composed of sodium acetate and acetic acid. It is a compound with formula NaH(C2H3O2)2. It is a salt of acetic acid. It is a type of salt that can improve the taste, aroma, and stability of food and beverage products. It is a colorless solid that is used in seasonings and as an antimicrobial agent. It can also help to control the pH levels in fermented foods, which can prevent spoilage and increase their shelf life.

It is a white crystalline powder that is soluble in water and is commonly used as a flavor enhancer, preservative, and pH buffer in food production. In addition to its use in food production, It can also be used in other industries, such as pharmaceuticals, textiles, and personal care products.


  • Chemical formula: C4H7NaO4
  • Molar mass: 142.086 g·mol−1
  • Appearance: White powder
  • Odor: Acetic acid (vinegar) odor
  • Solubility in water: 1 g/mL
  • Solubility in alcohol: Slightly
  • Solubility in ether: Insoluble
Sodium Diacetate


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 a 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. 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. It is often used in savory foods such as soups, sauces, and snack foods to add a tangy, salty flavor. It is also used as a preservative to help prevent the growth of harmful bacteria and prolong the shelf life of food products.


Like all food additives, it is important to use sodium diacetate in moderation as consuming large amounts can have negative health effects, such as high blood pressure and other sodium-related health problems.

However, it’s important to note that excessive consumption of sodium diacetate may have adverse health effects, such as high blood pressure and heart disease, due to its high sodium content. Therefore, it’s recommended to limit the consumption of foods that contain high levels of sodium diacetate and to monitor their intake.