Manganate(VII) Redox Titrations (OCR A-Level Chemistry A): Quizzes

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Manganate(VII) Redox Titrations
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Why do manganate(VII) titrations not require a separate indicator?

They are self-indicating

What color indicates the end point in a manganate(VII) titration?

First permanent pale pink

Why must sulfuric acid be used instead of hydrochloric acid in these titrations?

Cl−\text{Cl}^- ions are oxidised by MnO4−\text{MnO}_4^-

Where should you read the meniscus when using KMnO4\text{KMnO}_4 solution in a burette?

Top of meniscus

What is the molar ratio of MnO4−\text{MnO}_4^- to Fe2+\text{Fe}^{2+} in their redox reaction?

1:5

What defines concordant titres in manganate(VII) titrations?

Values within ±0.10 cm³

How many electrons are transferred in the reduction of MnO4−\text{MnO}_4^- to Mn2+\text{Mn}^{2+}?

5

What is the main purpose of adding sulfuric acid to the conical flask?

Provides H+\text{H}^+ ions for reduction

What is the molar ratio of MnO4−\text{MnO}_4^- to ethanedioic acid in their reaction?

2:5

Which formula calculates moles from concentration and volume in cm³?

n=c×V1000n = c \times \frac{V}{1000}

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Redox and Electrode Potentials

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Rates of Reactions

Equilibrium

Acids, Bases and pH

Buffers and Neutralisation

Enthalpy and Entropy

Redox and Electrode Potentials

Transition Elements

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Rates of Reactions

Equilibrium

Acids, Bases and pH

Buffers and Neutralisation

Enthalpy and Entropy

Redox and Electrode Potentials

Transition Elements

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