Redox Titrations
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Why are indicators not always needed for redox titrations?
Because one chemical is a transition metal which are coloured. A change in its colour or fading of the colour indicates the end point
What are the examples of redox tritrations you need to know?
Manganate (VII), Ethanedioate and dichromate (VI)
Describe the procedure of Manganate (VII) Tritration.
• Standard solution of KMnO4 added to burette • Using a pipette, a measured volume of solution under analysis transferred to conical flask • Excess dilute H2SO4 added to provide H+ • Trial titration carried out • KMnO4 added from burette and oxidises solution under analysis (Fe2+ —> Fe3+ • MnO4- ions reduced to Mn2+ and lose purple colour (pale pink) • Once all the chemical under analysis has been oxidised, next drop of KMnO4 remains purple after swirling. pale pink —> purple • Record Titre • Repeat titration until 2 concordant (withing 0.1cm3) results are achieved
What is the equation of redox tritration of permanganate and Fe2+?
MnO4- + 5Fe2+ + 8H+ —> 5Fe3+ + Mn 2+ + 4H2O