Visualizing Dissolution, Ion Mobility, and Precipitation through a Low-Cost, Rapid-Reaction Activity Introducing Microscale Precipitation Chemistry

• Bob Worley ^[2] ; Eric M. Villa ^[1] ; Jess M. Gunn ^[1] ; Bruce Mattson ^[1]
  1. [1] Creighton University

     Creighton University

     City of Omaha, Estados Unidos

     
  2. [2] Brunel University Science Park, United Kingdom
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 96, Nº 5, 2019, págs. 951-954
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • 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.