If a student first takes acid in a beaker and then adds water while diluting acid, what is the main mistake?
Answer and explanation
Correct answer: Adding water to acid can cause violent splashing
Diluting a concentrated acid is exothermic: heat is released when acid mixes with water. If a small amount of water is poured into a larger amount of concentrated acid, that water can heat suddenly, boil locally, and eject acid droplets. The safe laboratory rule is to add acid slowly to a larger volume of water while stirring and wearing protection. Therefore option A identifies the mistake and its hazard.
Frequently asked questions
What is the correct answer to this question?
Adding water to acid can cause violent splashing
Why is this the correct answer?
Diluting a concentrated acid is exothermic: heat is released when acid mixes with water. If a small amount of water is poured into a larger amount of concentrated acid, that water can heat suddenly, boil locally, and eject acid droplets. The safe laboratory rule is to add acid slowly to a larger volume of water while stirring and wearing protection. Therefore option A identifies the mistake and its hazard.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
