Sodium acetate trihydrate 99,5+% pure

What is Sodium Acetate?

Sodium acetate is a colorless salt that smells faintly of vinegar. It is the sodium salt of acetic acid and is formed, for example, when caustic soda, sodium carbonate or sodium hydrogen carbonate react with acetic acid. Sodium acetate is correctly abbreviated as NaOAc. However, occasionally the wrong abbreviation NaAc is found (the abbreviation Ac only stands for an acetyl group −C(O)CH3). The meaning of the abbreviation Ac is only applicable in the field of organic chemistry. In inorganic chemistry, Ac is the symbol for the element actinium.

What is Sodium Acetate used for?

Sodium acetate is the food additive E262a. It is used as an acidity regulator and preservative for fruit and vegetables in cans and glasses, bread, fish in all variations, delicatessen salads, mayonnaise and salad dressings. It is also used in combination with various fruit acids (malic acid, citric acid, tartaric acid, etc.) as an ingredient in potato chips with the flavor “Salt & Vinegar”. (note that this particular sodium acetate is not food grade)

Sodium acetate is also sometimes used in cosmetics, where it acts as a buffer and masks the underlying odor.

For demonstration experiments, crystals resembling ice can be easily produced from a supersaturated sodium acetate solution. For this purpose, seed crystals are placed at the bottom of a beaker and slowly poured over with a supersaturated sodium acetate solution. Crystals immediately form and pile up to form an iceberg-like tower.

The so-called "instant ice cream" is based on the same principle. A (transparent) vessel is filled with the solution and the surface of the solution is touched with the fingertip. This immediately crystallizes and becomes solid as ice. (The fingertip replaces the seed crystal here.)

The crystallization of the sodium acetate is highly exothermic, releasing a lot of energy in the form of heat. It is used in heating pads, where the trihydrate in regenerable hand warmers serves as a storage for latent heat.

-As latent heat storage

Up to 2.5 MWh of heat per 20 foot ISO container (approx. 33 m³) can be transported in retrofitted tank containers containing sodium acetate as latent heat storage, which corresponds to approx. 75 kWh per m³. For example, the waste heat from cogeneration plants can be used.

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Technical data

Empirical formula NaCH₃COO · 3 H₂O
Molar mass (M) 136,08 g/mol
Density (D) 1,42
Melting point (mp)58 °C
Solubility 408 g/l (H₂O, 20 °C)
WGK 1
CAS No.[6131-90-4]
EG-Nr. 204-823-8

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