Acetate of sodium 2915290000
Sodium acetate CH3COONa, a sodium salt of acetic acid, is produced and widely used on an industrial scale.
Sodium acetate is used in the textile industry to neutralize waste sulfuric acid in waste water and as a photoresist when using aniline dyes. Also used in chrome salt tanning (for pickling), and slows down the vulcanization of chloroprene in the production of synthetic rubbers.
Sodium acetate is known as food additive E262 and is used as a preservative.
In solution, sodium acetate (being a salt of a weak acid) and acetic acid can be used as a buffer to keep the pH relatively constant. It is especially useful in biochemistry in pH-dependent reactions.
Sodium acetate is also used in everyday life as a compound heating pad or chemical heaters (eng. Hand warmer), used as a component of a mixture of "hot ice" (eng. "hot ice"), during the crystallization of sodium acetate, heat is released - this is an exothermic process. When sodium acetate trihydrate (which has a melting point of 58 ° C) is heated to 100 ° C (usually a container with it is placed in boiling water), it melts (or rather, dissolves in its own crystallization water) and passes into an aqueous solution of sodium acetate. When this solution is cooled, a supersaturated solution of sodium acetate in water is formed. This solution is perfectly subcooled to room temperature without the formation of a solid phase, then by pressing on the metal disk in the container, a crystallization center is formed, which, growing, makes the supersaturated solution pass into the solid phase of sodium acetate trihydrate. This process is accompanied by a significant evolution of heat (exothermic reaction). this process releases about 264-289 kJ / kg (Heat of the phase transition).
A rather beautiful experience is based on this property - “hot ice »