Assertion (A) : To dilute sulphuric acid, acid is added to water and not water to acid. Reason (R) : Specific heat of water is quite large.

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Assertion (A) : To dilute sulphuric acid, acid is added to water and not water to acid. 

Reason (R) : Specific heat of water is quite large. 

(a) Both A and R are true and R is the correct explanation of A 

(b) Both A and R are true but R is not the correct explanation of A 

(c) A is true but R is false 

(d) A is false but R is tru


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Salim Ahmed Kawsar

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(a) Sulphuric acid (H2SO4) reacts very vigorously with water, in a highly exothermic reaction. Thus if you add water to concentrated sulfuric acid, it can boil and you may get a nasty acid burn. That's why for dilution, acid is added to water not water to acid as specific heat of water is quite large and it can absorb large quantity of heat produced by sulphuric acid. Moreover water is less dense than sulphuric acid, so if you pour water on the acid, the reaction occurs on top of the liquid. If you add the acid to the water, it sinks and any wild and crazy reactions have to get through the water or beaker to get to you.

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