Resumen de Visualizing Dissolution, Ion Mobility, and Precipitation through a Low-Cost, Rapid-Reaction Activity Introducing Microscale Precipitation Chemistry
Bob Worley, Eric M. Villa, Jess M. Gunn, Bruce Mattson
We describe here an activity that enables students to visualize the dissolution process, ion mobility, and precipitation on a microscale level, all in 30 s. A small puddle of water consisting of approximately 10 drops is placed on a plastic sheet cover. Two small crystals of water-soluble salts are transferred by toothpicks and simultaneously introduced to the puddle from opposite sides. Within 30 s, a precipitate forms where the two ionic solutions meet and the result usually looks somewhat like a cat’s eye marble. A significant feature of this activity is that it uses a minimum amount of resources.
