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A learner must mix a strong acid with water in a laboratory. Which order is the safe one?
AAdd the water to the acid
BAdd the acid to the water
CAdd both at the same time
DAdd ice to the acid first
Answer & Solution
Correct answer: B. Add the acid to the water
1. Mixing acid and water releases heat, and heat released too fast can spit the liquid out of the container.
2. The safety rule is short and fixed: never add water to acid, always add the acid to water.
3. Pouring water onto acid puts a small mass of water on a large mass of acid, so the heat is concentrated and dangerous.
_Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 1: Skills for science_
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