When working with acids, what is the correct procedure?

The ideal procedure when working with acids is to always pour acid into water, which minimizes the risk of a violent exothermic reaction. When acid is added to water, the water absorbs the heat generated by the dilution process, helping to prevent splattering and potential injury. This method allows for better control over the mixing process and reduces the chance of generating fumes or spills that can occur if the reaction becomes too vigorous.

In contrast, pouring water into acid can lead to dangerous situations. When water is introduced to concentrated acid, it can cause the mixture to boil explosively, resulting in splashes and exposure to harmful chemicals. This risk highlights the importance of the recommended procedure to maintain safety in chemical handling.

While diluting acid before use is an important practice, the essence of the question focuses on the method of mixing. Therefore, understanding the proper sequence of adding acid to water is crucial for ensuring safety during chemical procedures.