10 Questions
What is the purpose of Zimmermanns' reagent in the titration of ferrous iron with potassium permanganate in the presence of chloride ions?
To prevent the oxidation of chloride ions by potassium permanganate
Why is phosphoric acid added when using standard dichromate solution for the determination of ferrous iron?
To lower the oxidation potential of the Fe3+/Fe2+ system
What effect does phosphate ions have on the determination of ferrous iron when using Zimmermanns' reagent?
They form a complex with ferric iron, making the end point more visible
Why is diphenylamine indicator used as an internal redox indicator in the determination of ferrous iron with standard dichromate solution?
To indicate the endpoint of the titration through a color change
What is the purpose of adding manganous sulphate solution to Zimmermanns' reagent?
To lower the oxidation potential of MnO4-/Mn2+ system
What is the purpose of Zimmermanns' reagent in the titration of ferrous iron with potassium permanganate in the presence of chloride ions?
To prevent the oxidation of chloride ions by potassium permanganate
What effect do phosphate ions have on the determination of ferrous iron when using Zimmermanns' reagent?
They lower the oxidation potential of Fe3+/Fe2+ system
Why is phosphoric acid added when using standard dichromate solution for the determination of ferrous iron?
To lower the oxidation potential of Fe3+/Fe2+ system
Why is diphenylamine indicator used as an internal redox indicator in the determination of ferrous iron with standard dichromate solution?
To indicate the endpoint visually
What is the purpose of adding manganous sulphate solution to Zimmermanns' reagent?
To lower the oxidation potential of MnO4-/Mn2+ system
Explore the applications of redox reactions in the determination of ferrous iron using titration with potassium permanganate. Learn about the potential interference of chloride ions and the use of Zimmermanns' reagent to prevent it.
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