Why does the solution becomes turbid on dilution the preparation with water​

This question is incomplete since you did not provide an specific case where this is happening. Anyway, I will give you an explanation that will be useful for you to understand why this happens.

Explanation:

 Turbidity is due to the presence of small particles in the water that are difficult to filter or remove by oxidation. Turbid water is due to algae growth, high pH, or poor filtration.

These particles cause the water to stop being clear. The more particles that are suspended over the water, the more cloudy it will be.

to give the reader a sense of the chaos, fear, and havoc taking place

"a" because he is appealing to logic as oppose to appealing to the audience's emotions.