Formation of a mirror
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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. Purpose. To observe a silver plating reaction. Demonstration. Sugar was one of the solutions in the flask A silver ion solution was the other solution

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Formation of a Mirror

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Formation of a mirror

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


Purpose

Purpose

  • To observe a silver plating reaction


Demonstration

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+


Concepts

Concepts

1.Redox Reactions

2.Selective Organic Reactions


1 redox reactions

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


2 selective organic reactions

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


    Conclusions

    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


    Comments

    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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