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6. Electrolysis of salt water is used on an industrial scale to produce chlorine gas. Chlorine gas is toxic if breathed in large quantities. In fact, it was also used as a chemical weapon in World War 1, so be careful with this step! DO NOT DO THIS STEP IF YOU HAVE ASTHMA OR RESPIRATORY PROBLEMS. We will test that chlorine gas really is being produced at one of the electrodes. Take the test-tube off the electrode that produced chlorine gas, keeping a finger over the top to minimize gas escaping. Hold the test-tube at arms length. And using proper safe smelling technique, release the gas and waft it towards you. **TEACHER NOTE** SAFETY INSTRUCTIONS: Instruct students to hold the test-tube at arm’s length, still keeping a finger over the top. Then release the gas and gently waft it towards their nose. Students should not put their nose directly over the tube to inhale the gas. Q24. What, if anything, do you smell?: (i) rotten eggs (ii) bananas (iii) bleach (iv) alcohol (v) nothing Q25. List some reasons producing chlorine gas on an industrial scale is useful: it’s used in bleach, pool disinfectant 7. Thesameelectrolysissetupisalsousedtoproducelye(NaOH),whichisusedforovencleaner,drain cleaner, and soap. The sodium ions are floating around everywhere. Q26. Which electrode creates the OH- ions that form lye? Circle one: cathode / anode Part 3 – Metal Electrodes What happens if we use metal electrodes instead of the graphite core of pencils? We will try using pennies, which are coated with a layer of copper (Cu). 1. In a clean cup, mix up a different electrolyte solution. 1/2 cup water + 3 tsp Epsom salt 2. Setup and test the apparatus with metal electrodes. a) Attach alligator clips to each of two shiny, clean pennies. b) Place the pennies in the Epsom salt solution, making sure they do not touch. Use the reduction potential table at the back of your lab to make some predictions. Q27. What do you expect to be reduced at the cathode (negative battery terminal)? (i) H2O (ii) Mg2+ Q28. Write down the balanced chemical equation for the reduction reaction: Created by LABScI at Stanford 9PDF Image | Electrolysis splitting water
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