Oxidizing and Reducing Agents

 Identification of oxidizing and reducing agents using solutions of acidified potassium dichromate (VI), hydrogen peroxide, acidified potassium iodide, acidified potassium manganate (VII), bleach

Aim / Objective: 

To identify oxidizing and reducing agents using solutions of acidified potassium dichromate (VI), hydrogen peroxide, acidified potassium iodide, acidified potassium manganate (VII), bleach.

Introduction: 

An oxidizing agent, or oxidant, is one that gains electrons and is reduced in a chemical reaction. They are also known as electron acceptors, the oxidizing agent is normally in one of its higher possible oxidation states because it will gain electrons and be reduced. Some examples of oxidizing agents include potassium nitrate, halogens and nitric acid.

A reducing agent, or reductant, loses electrons and is oxidized in a reaction.  A reducing agent is usually in one of its lower possible oxidation states and is the electron donor. A reducing agent is oxidized because it loses electrons in the redox reaction. Examples of reducing agents include formic acid, sulfite compounds and earth metals.

Materials/ Apparatus:

Hydrogen peroxide (H2O2), acidified iron (II) Sulphate (FeSO4), acidified potassium iodide (KI), acidified potassium dichromate(VI) (K2Cr2O7) acidified potassium manganate (VII) (KMnO4), sulphuric acid (H2SO4), bleach (NaClO), 7 test tubes, test tube rack, glass stirring rod, metal boiling tube holder, droppers, sodium hydroxide (NaOH).

Method / Procedure:

  1. Label test tubes 1-7 and place in test tube rack
  2. Half fill test tube 1 with acidified KI and use a dropper to add acidified potassium dichromate (VI) (K2Cr2O7) to the solution. Note color change.
  3. Half fill test tube 2 with acidified KI and use a dropper to add acidified potassium manganate (VII) (KMnO4) to the solution. Note color change.
  4. Half fill test tube 3 with acidified KI and use a dropper to add NaClO to the solution. Note color change.
  5. To test tube 4 half fill with hydrogen peroxide (H2O2) and use a dropper to add acidified KMnO4 to the solution. Note color change.
  6. Half fill test tube 5 with KI and use a dropper to add H2O2 to the solution. Note color change.
  7. Half fill test tube 6 with H2O2 and use a dropper to add acidified K2Cr2O7 to the solution. Note color change.
  8. To the final test tube half fill with FeSO4 and use a dropper to add acidified K2Cr2O7 to the test tube. Add sodium hydroxide (NaOH) to the test tube and note color change.
  9. Tabulate results

Suggested Results:

 

oxidizing and reducing agents 1 oxidizing and reducing agents 2 oxidizing and reducing agents 3 oxidizing and reducing agents 4

 

Hope this one helps, remember to keep reading and studying as the weeks go by and your exams will be great.

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