Science — AI-generated practice question

Mixing concentrated acid with water is a highly exothermic process. If water is added to a concentrated acid, the large amount of heat generated can cause the mixture to splash out violently, causing burns. The glass container may also break due to excessive local heating. Therefore, acid must always be added slowly to water with constant stirring, so heat is dissipated safely by the large volume of water.

Source: Chapter 2, Section 2.2.1

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• The key reason is exothermic reaction — examiners expect this term.
• Mention both consequences: splashing/burns AND possible breakage of glass container (each is worth a point in a 2-mark answer).
• The phrase "acid to water, never water to acid" is a standard lab safety rule — state the correct procedure too.
• Do not go into pH or ionisation; that is off-topic for this question.