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Crystallization of supersaturated sodium acetate

Crystallization of supersaturated sodium acetate. When sodium acetate trihydrate (CH3COONa 3H2O) melts at 58C, it releases bound water (water of crystallization) and dissolves in it. When the solution is allowed to cool slowly, it becomes supersaturated. If a nucleation centre is formed or introduced, it causes the solution to crystallize back into solid sodium acetate trihydrate. This process is exothermic and releases heat. It found its use in consumer heating pads.
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Título:
Crystallization of supersaturated sodium acetate
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Crystallization of supersaturated sodium acetate. When sodium acetate trihydrate (CH3COONa 3H2O) melts at 58C, it releases bound water (water of crystallization) and dissolves in it. When the solution is allowed to cool slowly, it becomes supersaturated. If a nucleation centre is formed or introduced, it causes the solution to crystallize back into solid sodium acetate trihydrate. This process is exothermic and releases heat. It found its use in consumer heating pads.
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Album / Science Source / GIPhotoStock
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Tamaño imagen:
3383 x 5101 px | 49.4 MB
Tamaño impresión:
28.6 x 43.2 cm | 11.3 x 17.0 in (300 dpi)
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