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• Take 2-3 crystals of potassium permanganate and dissolve them in 100 mL of water.

• Take out approximately 10 mL of this solution and put it into 90 mL of clear water.
• Take out 10 mL of this solution and put it into another 90 mL of clear water.
• Keep diluting the solution like this 5 to 8 times.
• Is the water still coloured ?

NCERT Class 9th Science Ch 1 Matter in Our Surroundings


The water is still coloured because the potassium permanganate is still present in the water 
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