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Redox Titrations: Potassium Manganate and Iron

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Redox Titrations: Potassium Manganate and Iron

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Questions and Answers

What type of titration is used to determine the concentration of an oxidizing or reducing agent in a solution?

Redox titration (correct)

Acid-base titration

Precipitation titration

Complexometric titration

Which of the following is not a common reducing agent used in redox titrations?

Iron(II)

Sodium thiosulfate

Oxalic acid

Potassium permanganate (correct)

What is the balanced equation for the reaction between iron(II) and potassium permanganate?

$Fe^{2+} + 2MnO4^{-} + 16H^{+} ightarrow Fe^{3+} + 2Mn^{2+} + 8H2O$

$Fe^{2+} + 2MnO4^{-} + 10H^{+} ightarrow Fe^{3+} + 2Mn^{2+} + 5H2O$

$2Fe^{2+} + MnO4^{-} + 8H^{+} ightarrow 2Fe^{3+} + Mn^{2+} + 4H2O$

$Fe^{2+} + MnO4^{-} + 8H^{+} ightarrow Fe^{3+} + Mn^{2+} + 4H2O$ (correct)

What is the balanced equation for the reaction between sodium thiosulfate and iodine?

$2S2O3^{2-} + I2 ightarrow S4O6^{2-} + 2I^{-}$ Signup and view all the answers

Which of the following is used to standardize a potassium manganate(VII) solution?

Oxalic acid Signup and view all the answers

What is the purpose of calculating the volume and moles of reactants in a redox titration?

To determine the concentration of the analyte Signup and view all the answers

Study Notes

Redox Titrations

Redox titrations determine the concentration of an oxidizing or reducing agent in a solution.

Potassium Manganate(VII) Titrations

Potassium manganate(VII) (KMnO4) is a powerful oxidizing agent used in redox titrations.
KMnO4 is standardized against oxalic acid solution.
Oxalic acid reacts with KMnO4 according to the equation: C2O4^{2-} + 2MnO4^{-} + 16H^{+} → 2CO2 + 2Mn^{2+} + 8H2O.

Iron(II) Titrations

Iron(II) (Fe2+) can be oxidized to iron(III) (Fe3+) by oxidizing agents like potassium permanganate.
The reaction between iron(II) and potassium permanganate is: Fe^{2+} + MnO4^{-} + 8H^{+} → Fe^{3+} + Mn^{2+} + 4H2O.

Sodium Thiosulfate Titrations

Sodium thiosulfate (Na2S2O3) is a common reducing agent used in redox titrations.
Sodium thiosulfate is often used to standardize an iodine solution.
The reaction between sodium thiosulfate and iodine is: 2S2O3^{2-} + I2 → S4O6^{2-} + 2I^{-}.

Reaction Volume Calculation and Moles

In redox titrations, it's essential to calculate the volume and moles of reactants used.

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Description

Learn about redox titrations involving potassium manganate(VII) and iron, including the standardization process against oxalic acid. This quiz covers the principles and specific procedures of redox titrations for these substances.