Adding a small amount of potassium permanganate (KMnO4) to distilled water and then redistilling it can help remove traces of organic impurities and improve the purity of the water, resulting in "double distilled water"

 Adding a small amount of potassium permanganate (KMnO4) to distilled water and then redistilling it can help remove traces of organic impurities and improve the purity of the water, resulting in "double distilled water". 

Here's a more detailed explanation:

KMnO4 as an Oxidizing Agent:

Potassium permanganate is a strong oxidizing agent, meaning it readily gains electrons and oxidizes other substances. 

Removing Organic Impurities:

In the context of water purification, KMnO4 is used to oxidize dissolved organic materials, including surfactants, that may be present in distilled water. 

Distillation Process:

After adding KMnO4 to distilled water, the mixture is then distilled again. This process involves heating the water, causing it to evaporate, and then condensing the vapor back into liquid form. 

Purification:

The distillation process effectively separates the purified water from any remaining impurities, including the oxidized organic compounds, leading to a higher purity water. 

Double Distilled Water:

This process of adding KMnO4 and redistilling is often used to produce "double distilled water" or "triple distilled water," which is known for its high purity and suitability for scientific and laboratory applications.