Mohr's Salt KMnO4 Redox titration | M/20 Mohr salt Solution |Class 12 Chemistry Practical

How to prepare Mohr's salt M/20 standard solution
Prepare standard solution of M/20 mohrs salt and find out the the molarity of unknown KMnO4 solution..

Determination of strength of KMnO4 using standard solution of Mohr's salt

In this titration, potassium permanganate is the oxidizing agent and Mohr’s salt is the reducing agent.

Mohr’s salt is a double salt of ferrous sulphate and ammonium sulphate and its composition is FeSO4.(NH4)2SO4.6H2O.
It is a primary standard. Therefore, its standard solution can be prepared directly. Ferrous ions of Mohr’s salt undergo hydrolysis in aqueous solution. To prevent the hydrolysis, Conc. H2SO4 needs to be added to the Mohr’s salt crystals during the preparation of its standard solution.
theory
Oxidation-Reduction Titrations or Redox Titrations

The titration based on oxidation and reduction reaction between the titrant and analyte is called Redox titration. Oxidation is the process of the addition of oxygen or removal of hydrogen/electron and reduction involves the process of addition of hydrogen/electrons or removal of oxygen. Oxidizing agents are substances that gain one or more electrons and are reduced. Reducing agents are substances that lose one or more electrons and are oxidized. That is, oxidizing agents are electron acceptors, and reducing agents are electron donors.

In redox systems, the titration method can be adopted to determine the strength of a reductant/oxidant using a redox sensitive indicator. Redox titrations involving potassium permanganate are called permanganometric titrations. In these reactions, MnO4- ions acts as the self indicator.
In this titration, the MnO4- ion is reduced to Mn2+ in the presence of acid and Fe2+ ions of Mohr’s salt is oxidized to Fe3+

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