Chemistry Practicals Class 12
Redox Titration of Oxalic Acid with KMnO4
- Perform science experiments at your fingertips
- Learn anytime and from anywhere
- 3D gamified way of advanced learning
- Boost your academic score
- Accessible through Mobile, Laptop, Desktop, and Tablet
- Gain a competitive edge in IIT and NEET exams
- In this Chemistry virtual lab, you will understand the terms - volumetric analysis, molarity, molality, normality, and redox titration.
- You will learn to calculate the strength of KMnO4 by titration of oxalic acid with KMnO4.
- Through this science experiment, you will understand the purpose of the addition of dil. H2SO4 and the purpose of heating oxalic acid solution before titration.
- You will acquire the skills to prepare a standard solution of oxalic acid.
- In this redox titration experiment, you will understand the significance of the primary standard solution and secondary standard solution.
- After understanding the different steps, you will acquire the skills to perform the redox titration experiment in the real lab.
Redox titration is the most common laboratory method used to determine the concentration of a given analyte by causing a redox reaction between the titrant and the analyte. The redox reaction is based on an oxidation and reduction reaction between the titrant and the analyte. An example of redox titration is “Titration of potassium permanganate (KMnO4) against oxalic acid (C2H2O4)”.
Redox titrations involving potassium permanganate are called permanganometric titrations. In these titrations, MnO–4 ions act as the self-indicator. The reaction between MnO–4 ions and oxalic acid is carried out in an acidic medium because permanganate ions in an acidic medium act as a very strong oxidising agent. Acidity is introduced by adding dil. H2SO4.
2KMnO4 + 3H2SO4 + 5(COOH)2 → K2SO4 + 2MnSO4 + 8H2O + 10CO2 ↑
The dark purple colour of potassium permanganate (KMnO4) solution disappears in the acidic medium due to the reduction of permanganate (MnO–4) ions to manganous (Mn2+) ions. On reaching the endpoint, adding the single drop of permanganate imparts a light pink colour to the solution.
Watch this video to learn more about chemistry.
Requirements for this Science Experiment
⦁ Volumetric Flask ⦁ Burette ⦁ Pipette ⦁ Weighing Balance ⦁ Weighing Bottle ⦁ Conical Flask ⦁ Burette Stand ⦁ Beakers ⦁ Bunsen Burner ⦁ Tripod Stand ⦁ Wire Gauze ⦁ Glass Rod ⦁ Spatula