Question

While mixing $H_{2}S{O}_4$ with water which of the following precautions should be taken?

• A. Never add acid to water
• B. Never add water to acid
• C. Add the lighter heavier liquid
• D. Avoid sunlight

Answer 1

Answer: (B)

Never add water to acid

$\left(B\right)$ Never add water to acid.

$Reason$ : As we know sulphuric acid is very exothermic(when dissolve in water), several safety precautions are taken with the dilution and transportation of sulphuric acid.When you mix concentrated sulfuric acid and water, you pour the acid into a large amount of water, sulphuric acid($H_{2}S{O}_4$) reacts very vigorously with water, in a highly exothermic reaction.If you add water to concentrated sulfuric acid($H_{2}S{O}_4$) , the first drop of water reacts immediately, and heat might be high enough to boil the water instantly, which could spray acid out of the container.