Question

why one test tube of 2m sulphuric acid is required is permanganate titration​

Answer 1

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Add a test tube full of sulfuric acid in order to prevent oxidation of manganese to form manganese dioxide. Heat the mixture upto 60°C before titrating with potassium permanganate.

Answer 2

Titration with potassium permanganate requires the use of strong acid solutIon like concentrated H₂SO₄

• KMNO₄ or Potassium permanganate acts as an own indicator for titration and therefore, it is an advantage for titration.

• Titrations with KMNO₄ requires strong acids because sulphuric acid does not reduce the accuracy of titration.

• Reduction of accuracy can be seen when HCl and nitric acid are used.

• Therefore, for titration, sulphuric acid is the best choice of strong acid.