Wastewater New York State Practice Exam

The correct method for diluting sulfuric acid is to add the acid to the water. This approach is essential for safety reasons. When sulfuric acid is mixed with water, it releases a significant amount of heat. If water is added to a concentrated acid, it can lead to an explosive reaction, as the heat generated can cause the acid to splatter or boil violently. By adding the acid to the water, the heat generated is distributed over a larger volume of liquid, reducing the risk of splattering and ensuring a safer dilution process.

Using a pre-diluted solution may not be appropriate in all cases, as it depends on the specific application and concentration required. Mixing both in equal portions does not account for the exothermic nature of the reaction with sulfuric acid, which could lead to dangerous spattering. Therefore, adding the acid to the water is the recommended and safest procedure for dilution.