Question

How do you do redox titration problems?

Answer 1

As we know that the redox titration is a laboratory method which is used to determine the concentration of the given analyte that can be done by reacting the analyte with a titrant and a redox indicator.

Complete step-by-step answer:
As we have learnt till now that the redox types of titrations are based on oxidation and reduction reactions that involve the transfer of electrons between the given analyte and the titrant. For instance: titration of potassium permanganate against the oxalic acid.

Steps involved in the redox titration are as followed:
-A standard solution of oxalic acid which is our analyte is prepared by knowing the molecular mass of oxalic acid and calculating the weight to be dissolved in the solution.
-Then the titrant which is potassium permanganate is titrated against the oxalic acid which is acting as a reducing agent in the reaction and potassium permanganate acts as an oxidizing agent. This reaction takes place in the presence of an acidic medium which can be provided by dilute sulphuric acid. -Potassium permanganate acts as an indicator in this redox reaction where permanganate ions are reduced to manganese ions in the presence of acidic medium.
-We can show this chemical equation to express the redox titration reaction as:
$2MnO_4^ - + 16{H^ + } + 5{C_2}O_4^ - \to 2M{n^{2 + }} + 8{H_2}O + 10C{O_2}$

Note: Always remember that the permanganate in the redox reaction acting as an indicator results in a light pink color when it reaches its end point. Thus, visualization of end point in redox titration is easy either by looking at the pinkish color of the acid and base combinations or by the disappearance of the color of permanganate.