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Formation of a Mirror

This experiment illustrates the fascinating process of silver plating, where a brilliant mirrored surface forms inside a flask. By combining a silver ion solution with a sugar solution, a redox reaction occurs: sugar is oxidized while silver ions are reduced to metallic silver. This demonstration highlights key concepts of redox reactions and selective organic reactions. It showcases Tollen’s Reaction, effectively indicating the presence of oxidizable sugars. The process vividly illustrates oxidation and reduction, revealing the beauty of chemistry in action.

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Formation of a Mirror

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Presentation Transcript

  1. Formation of a Mirror A solution is added to a flask. Within seconds a brilliant mirrored surface forms on the inner wall of the flask

  2. Purpose • To observe a silver plating reaction

  3. Demonstration • Sugar was one of the solutions in the flask • A silver ion solution was the other solution • Oxidation of the carbon occurred when silver ion was reduced • The silver metal reduction product adhered to the glass reduction Ag Ag+

  4. Concepts 1. Redox Reactions 2. Selective Organic Reactions

  5. 1. Redox Reactions • In a redox reaction, one substance loses electrons while another substance gains electrons • “Redox” is a conventional term which is a combination of the words “reduction” AND “oxidation” • The substance that loses electrons is said to be oxidized and/or the reducing agent • The substance that gains electrons is said to be reduced and/or the oxidizing agent

  6. 2. Selective Organic Reactions • Organic compounds may be totally oxidized to carbon dioxide and water • gasoline oxidation (combustion) • Organic compounds may be selectively oxidized by adding an oxygen atom to just one carbon • C O C O H O H oxidation

  7. Conclusions • The formation of silver metal was due to the reduction of silver ion • The reducing agent for silver ion was the sugar • The sugar was simultaneously oxidized as the silver ion was reduced

  8. Comments • Oxidation (the loss of electrons) of one specie is always accompanied by the reduction (the gain of electrons) of another specie • The reaction in this demonstration is the “Tollen’s Reaction” and is a test for the presence of oxidizable sugars

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