Question

multiple - choice question
when diluting concentrated acid with water you should always:
add acid to the water quickly while stirring
add water to the acid slowly while stirring
add acid to the water slowly while stirring
add water to the acid quickly while stirring

Explanation:

When diluting concentrated acid with water, adding acid to water slowly while stirring is correct. This is because concentrated acid - water dilution is an exothermic process. Adding water to acid can cause the acid to splash out due to rapid heat - generation, which is dangerous. Adding acid to water slowly allows the heat to be dissipated gradually.

Answer:

Add acid to the water slowly while stirring