Which is the sodium salt of acid
Sodium acetate is a colorless salt that smells faintly of vinegar, the sodium salt of acetic acid and is formed, for example, from sodium hydroxide solution, sodium carbonate or sodium hydrogen carbonate and acetic acid.
Sodium acetate crystallizes from aqueous solutions with 3 mol of crystal water: Na (CH3COO) 3H2O. This Trihydrate forms large, colorless crystals and is readily soluble in water (612 g / l at 20 ° C) and dissolves in its own crystal water from 58 ° C. At a higher temperature (~ 120 ° C) the water of crystallization evaporates and it is formed anhydrous sodium acetate To3COO), sometimes also NaAc (spelling of inorganic), "organically correct" NaOAc written. The anhydrous salt is also colorless and attracts humidity, it is hygroscopic and readily soluble in water (365 g / l at 20 ° C). A mixture of sodium acetate and acetic acid is what is known as a buffer solution, which means that the pH value remains almost constant even after adding (small amounts) of acid or lye. Sodium acetate is poorly soluble in alcohol.
Sodium acetate is the food additiveE 262. 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.
Icebergs can be easily made from saturated sodium acetate solution in show chemistry.
To do this, place a seed crystal on the bottom of a beaker (or similar) and slowly pour the saturated solution onto it. The crystals of the solution immediately precipitate and pile up to form an iceberg-like tower.
The so-called "Instant-ICE" 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 crystallizes out immediately and becomes solid like ice. (The fingertip replaces the seed crystal here)
Nevertheless, caution is advised in these beautiful chemistry experiments: the reaction is strongly exothermic and becomes very hot.
The "hand warmers" make use of the exothermic reaction, because a lot of energy is released in the form of heat during crystallization.
The trihydrate is used in regenerable hand warmers as latent heat storage.
Categories: Sodium Compound | acetate
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