A technician prepares dilute sulfuric acid for a class by adding concentrated sulfuric acid to water. The bottle of concentrated sulfuric acid carries the corrosive hazard symbol. The dilute acid is labelled with the exclamation mark symbol for an irritant. When concentrated sulfuric acid mixes with water, a large amount of heat is released.
State what is meant by corrosive.
Explain, in terms of the amount of acid in solution, why concentrated sulfuric acid is more hazardous than dilute sulfuric acid.
The technician always adds the acid slowly to a large volume of water and never adds water to the concentrated acid. Suggest why.
Give two precautions, other than the order of mixing, that the technician should take when diluting the acid.
A student spills some of the dilute sulfuric acid on the bench. Suggest how the spill should be made safe, and explain your answer.
230 exam-style questions on Edexcel GCSE Chemistry 1.1 Formulae, equations and hazards, covering 1.1.1 Formulae, word and balanced equations, 1.1.2 Balanced ionic equations, and 1.1.3 Hazard symbols and risk in practical work. Each one has a worked solution and a mark scheme showing where the marks go.