Chemistry Lab Safety Practice Test 2026 - Free Practice Questions and Safety Guidelines

Concentrated sulfuric acid release a lot of heat when it mixes with water, so controlling the heat is essential to stay safe. The best approach is to add the acid slowly to water while stirring and keeping the solution cool. This spreads the heat out and lets it be absorbed gradually, reducing the chance of the liquid boiling violently and splashing. Dumping water into the acid concentrates the heat at the contact point and can cause a dangerous, sudden boil. Similarly, neutralizing by dumping acid into base is not a controlled way to handle the heat, and pouring water quickly into the acid risks a dangerous splash. By adding acid to water slowly with stirring and cooling, you manage the exothermic reaction and lower the risk of injury.