Redox Titration Applications
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Questions and Answers

What is the purpose of Zimmermanns' reagent in the titration of ferrous iron with potassium permanganate in the presence of chloride ions?

  • To enhance the oxidation potential of the MnO4-/Mn2+ system
  • To form a complex with ferric iron, making the end point more visible
  • To lower the oxidation potential of the Fe3+/Fe2+ system
  • To prevent the oxidation of chloride ions by potassium permanganate (correct)

    • Why is phosphoric acid added when using standard dichromate solution for the determination of ferrous iron?

  • To enhance the oxidation potential of the MnO4-/Mn2+ system
  • To lower the oxidation potential of the Fe3+/Fe2+ system (correct)
  • To form a complex with ferric iron, making the end point more visible
  • To prevent the oxidation of chloride ions by potassium permanganate

    • What effect does phosphate ions have on the determination of ferrous iron when using Zimmermanns' reagent?

  • They prevent the oxidation of chloride ions by potassium permanganate
  • They enhance the oxidation potential of the Fe3+/Fe2+ system
  • They form a complex with ferric iron, making the end point more visible (correct)
  • They lower the oxidation potential of MnO4-/Mn2+ system

    • Why is diphenylamine indicator used as an internal redox indicator in the determination of ferrous iron with standard dichromate solution?

    <p>To indicate the endpoint of the titration through a color change</p> Signup and view all the answers

    What is the purpose of adding manganous sulphate solution to Zimmermanns' reagent?

    <p>To lower the oxidation potential of MnO4-/Mn2+ system</p> Signup and view all the answers

    What is the purpose of Zimmermanns' reagent in the titration of ferrous iron with potassium permanganate in the presence of chloride ions?

    <p>To prevent the oxidation of chloride ions by potassium permanganate</p> Signup and view all the answers

    What effect do phosphate ions have on the determination of ferrous iron when using Zimmermanns' reagent?

    <p>They lower the oxidation potential of Fe3+/Fe2+ system</p> Signup and view all the answers

    Why is phosphoric acid added when using standard dichromate solution for the determination of ferrous iron?

    <p>To lower the oxidation potential of Fe3+/Fe2+ system</p> Signup and view all the answers

    Why is diphenylamine indicator used as an internal redox indicator in the determination of ferrous iron with standard dichromate solution?

    <p>To indicate the endpoint visually</p> Signup and view all the answers

    What is the purpose of adding manganous sulphate solution to Zimmermanns' reagent?

    <p>To lower the oxidation potential of MnO4-/Mn2+ system</p> Signup and view all the answers

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