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Explore the fundamentals of electrolysis and redox reactions with this colorful, multipart activity. Students observe the electrolysis of water using a universal indicator solution and connect their observations to the chemical changes occurring at each electrode. Students also study the electrolysis of aqueous potassium iodide and extend their learning to predict the half-reactions of similar compounds.
Explore the fundamentals of electrolysis and redox reactions with this colorful, intuitive, multipart activity. First, students observe the electrolysis of water using a universal indicator solution and connect their observations to the chemical changes occurring at each electrode. Next, they investigate the differences between electrolytes in distilled and tap water. In the final activity, students study the electrolysis of aqueous potassium iodide and extend their learning to predict the half-reactions of similar halogen-containing compounds. Kit contains sufficient materials for a class of 30 students working in pairs.
|Bogen Universal Indicator with Chart, 100 mL||1||Included|
|Connector Cords with Insulated Alligator Clips||30||Included|
|Divided Petri Dishes||20||Included|
|1% Phenolphthalein Solution, 15 mL||1||Included|
|Potassium Iodide, 75 g||1||Included|
|Sodium Sulfate, 50 g||1||Included|
|Starch, 0.6 g||1||Included|
|Teacher’s Manual with Reproducible Student Guide||1||Included|
|Batteries, 9 V||15||Needed, Not Included|
|Bottle for Storing 0.5 M KI Solution, 250 mL (or larger)||1||Needed, Not Included|
|Distilled Water for Solutions, 325 mL||1||Needed, Not Included|
|Dropper Bottle for Storing Starch Solution||1||Needed, Not Included|
|Graduated Cylinders, 10 mL||15||Needed, Not Included|
|Lab Marker||1||Needed, Not Included|
|Pencil Leads (for a mechanical pencil)||15||Needed, Not Included|
|Sheets of White Copy Paper||15||Needed, Not Included|
|Spatula||1||Needed, Not Included|
|Stirring Rods||15||Needed, Not Included|
|Tap Water in a Beaker or Wash Bottle, 200 mL||1||Needed, Not Included|
|Timers||15||Needed, Not Included|
|Wash Bottles of Distilled Water||15||Needed, Not Included|
|Paper Towels||Needed, Not Included|
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