“Hielo” al instante
Publicado por sanferve el 7 de Febrero de 2009
Las disoluciones sobresaturadas son muy inestables: con sólo tocarlas, moverlas o introducir un objeto en ellas, se rompe el precario equilibrio y adquieren un estado más estable. Una sustancia adecuada para hacer este tipo de disoluciones es el acetato de sodio (Na-OOC-CH3). Basta con coger una cierta cantidad de agua, ponerla al fuego y verter sobre ella el acetato, agitando continuamente, hasta que ya no se pueda disolver más, es decir, hasta que la disolución esté saturada a la temperatura que alcanza la disolución puesta al fuego.
A continuación, ponemos la disolución en el frigorÃfico con lo cual la solubilidad del acetato disminuye (es el comportamiento general para todos los solutos, aunque hay excepciones); esto deberÃa conllevar que el exceso de soluto se depositara en el fondo del recipiente pero no sucede asÃ: queda en disolución en un estado metaestable, que es roto por cualquier perturbación.
Por cierto, la reacción es exotérmica y existen bolsas preparadas en el comercio, que se usan para calentarse las manos una vez desencadenado el proceso.
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