DentÃfrico para elefantes
Escrito por sanferve el 27 de Septiembre de 2008
Los elefantes deben necesitar una gran cantidad de pasta de dientes. En el siguiente vÃdeo vamos a ver cómo podemos fabricarle una para que no les salgan caries.
En una probeta de 1 L de capacidad, ponemos 5 mL de lavavajillas. A continuación, echamos en un vaso de precipitados 50 mL de peróxido de hidrógeno al 30 % y, en otro, una disolución de 10 g de KI y 10 cm³ de agua. Vertemos al mismo tiempo el contenido de los dos vasos en la probeta y observad qué sucede:
¿Qué ha ocurrido? El ion yoduro actúa como catalizador de la descomposición del peróxido de hidrógeno en agua y oxÃgeno. La reacción es exotérmica y produce un gran desprendimiento de calor, que da lugar a la formación de vapor de agua el cual, junto con el oxÃgeno, se mezclan con el lavavajillas y producen una gran cantidad de espuma.
El color amarillo de la espuma es debido al yodo formado en una reacción secundaria entre el peróxido de hidrógeno, los iones oxonio presentes en el agua y los iones yoduro.
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