Florida Wastewater Practice Test

What is the proper procedure for making a dilute acid solution for a titration?

1. Add the acid quickly to the dilution water

2. Mix acid and water in equal measures

3. Pour the dilution water into the acid

4. Add the acid slowly to the dilution water

The correct answer is: Add the acid slowly to the dilution water

When preparing a dilute acid solution for titration, it is essential to prioritize safety and proper procedure. The correct method is to add the acid slowly to the dilution water. This practice is crucial because when acid is added to water, the reaction generates heat, which can lead to splattering if the acid is added too rapidly. By pouring the acid gradually into the water, you allow the heat to dissipate more effectively and minimize the risk of a violent reaction. This method also ensures that the acid mixes uniformly with the water, leading to a more consistent dilution. On the other hand, adding water to acid, while sometimes mentioned, can create an even more hazardous situation as the heat generated might cause the mixture to boil or spatter. In summary, slowly adding acid to water is the safest and most effective technique for diluting strong acids, and it is critical to achieving the desired concentration for titration accurately.