Petri Dish Electrolysis

Build simple and inexpensive electrochemical cells in a Petri dish to compare the reactions of sodium sulfate, potassium iodide, and tin(II) chloride. This video is part of the Flinn Scientific Best Practices for Teaching Chemistry Video Series, a collection of over 125 hours of free professional development training for chemistry teachers - http://elearning.flinnsci.com ATTENTION: This demonstration is intended for and should only be performed by certified science instructors in a safe laboratory/classroom setting.