Because it can be highly exothermic which can cause an huge accident in that particular place that's why the acid should be added to water not the water to acid.And these the main reason why there are acid cause..

Introduction:
When diluting an acid, it is recommended to add the acid to water rather than water to the acid. This is because adding water to acid can lead to dangerous and uncontrollable reactions. Dilution is a process of reducing the concentration of an acid by adding water to it. The process must be carried out carefully to ensure safety.

Explanation:
1. Exothermic Reaction:
The process of diluting an acid is an exothermic reaction, which means it releases heat. When water is added to an acid, the heat generated can cause the mixture to rapidly boil and splatter. This can lead to severe burns or injuries.

2. Concentrated Acid:
Acids are usually highly concentrated solutions, which means they contain a large amount of acid molecules in a small volume of solution. When water is added to concentrated acid, the acid molecules are dispersed throughout the solution, allowing for a more controlled and safe dilution process.

3. Risk of Splashing:
Adding water to acid can create splashes and splatters due to the heat generated. These splashes can release acid droplets into the surrounding environment, increasing the risk of exposure and accidents. On the other hand, adding acid to water allows for better control and minimizes the risk of splashing.

4. Mixing Process:
When diluting an acid, it is important to mix the solution gently and slowly to prevent excessive heat generation and splattering. Adding the acid to water allows for better control over the mixing process. The acid can be added slowly while stirring continuously to ensure proper dilution.

5. Safety Precautions:
When diluting an acid, it is crucial to take proper safety precautions such as wearing protective goggles, gloves, and a lab coat. It is also recommended to dilute the acid in a well-ventilated area to prevent the inhalation of fumes.

Conclusion:
In conclusion, when diluting an acid, it is recommended to add the acid to water rather than water to the acid to ensure safety. Adding water to acid can lead to exothermic reactions, splattering, and increased risk of accidents. By following the proper dilution process and safety precautions, the concentration of the acid can be safely reduced to the desired level.