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Electrolysis of Water

Electrolysis of Water. Vanderbilt Student Volunteers for Science Training Presentation Spring 2012. Conversions of Electrical Energy to Other Forms. in these Examples Motors Heaters, toasters Light bulbs Electrolysis of water Doorbells. Electrical Energy is Converted to:

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Electrolysis of Water

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  1. Electrolysis of Water Vanderbilt Student Volunteers for Science Training Presentation Spring 2012

  2. Conversions of Electrical Energy to Other Forms in these Examples Motors Heaters, toasters Light bulbs Electrolysis of water Doorbells Electrical Energy is Converted to: • Mechanical • Thermal • Light • Chemical • Sound

  3. Electrical Energy  Chemical Energy (Electrolysis) Procedure (Part A) • Attach the alligator clips from the 9-volt battery to the electrodes. • Submerge the electrodes in distilled water. Results • Nothing happens in the distilled water.

  4. Electrical Energy  Chemical Energy – Electrolysis Part B • Attach the alligator clips from the 9-volt battery to the electrodes. • Add sodium sulfate salt into jar of distilled water. Submerge the electrodes into the salt water. Part C • Add Universal Indicator until solution is light green.

  5. Electrical Energy  Chemical Energy – Electrolysis Results • Oxygen gas bubbles at positive red electrode, hydrogen gas bubbles at black negative. • Universal Indicator turns purple color (basic) at negative, pink color (acidic) at positive electrode. • Hydrogen bubbles leave OH-. Oxygen bubbles leave H+. Conclusion • Electrical energy comes from the battery. • The electric energy is converted into chemical energy to decompose water. • Water is decomposed into hydrogen and oxygen. • Only ion solutions will conduct electricity.

  6. Distilled water + sodium sulfate conducts electricity  Decomposition of water Distilled water can not conduct electricity  No reaction Negative Hydrogen Positive Oxygen

  7. Negative Basic Positive Acidic

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