Question

why we add manganous sulphate in dissolved oxyegen method

Answer 1

Explanation:

In the first step, manganese(II) sulphate (at 48% of the total volume) is added to an environmental water sample.

Next, potassium iodide (15% in potassium hydroxide 70%) is added to create a pinkish-brown precipitate.

In the alkaline solution, dissolved oxygen will oxidize manganese(II) ions to the tetravalent state.