dilution of KMn04

This is because distilled water is nearly pure water, and there is almost no impurity in distilled water.

In tap water, there are a certain amount of impurities, and these impurities may react with the potassium permanganate reaction. For example, the chloride ions in tap water may react with acidified potassium permanganate solution.
2MnO4-(aq) + 16H+(aq) + 10Cl-(aq) → 2Mn2+(aq) + 8H2O(l) + 5Cl2(aq)

Moreover, when the potassium permanganate solution is mixing with the hydrogen peroxide solution, the impurities in the tap water may react with the hydrogen peroxide solution, or may act as the catalyst of decomposition of the hydrogen peroxide.

點解要投票？候選編號 001 根本就唔係答案。

u can use 5ml of KMnO4 to dilute into 2000ml water then u can use ........