Redox Titrations (AQA A-Level Chemistry): Flashcards

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Redox Titrations
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Two factors affecting redox potential

pH and ligand effects

Effect of acidic environment on reduction

Favours/promotes reduction

Formula of Tollens' reagent

[extAg(extNH3)2]+[ ext{Ag}( ext{NH}_3)_2]^{+}

Positive result for aldehyde with Tollens' reagent

Silver mirror forms on test tube walls

Why ketones don't react with Tollens' reagent

Lack hydrogen attached to carbonyl group

Endpoint colour in extMnO4− ext{MnO}_4^- titration

Faint pink colour persists

Mole ratio extFe2+ ext{Fe}^{2+} to extMnO4− ext{MnO}_4^-

5:1

Role of extMnO4− ext{MnO}_4^- in titrations

Strong oxidizing agent

Product when extKMnO4 ext{KMnO}_4 oxidizes extH2extO2 ext{H}_2 ext{O}_2

Oxygen gas (extO2 ext{O}_2)

Purpose of extH2extSO4 ext{H}_2 ext{SO}_4 in redox titrations

Maintains acidic environment

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