Suppose, in your lab, you have run out of dilute Sulphuric acid. You require dilute H2SO4 for an important synthesis but only have concentrated Sulphuric acid, water and a glass beaker. How will you synthesize dilute H2SO4 ?
Suppose, in your lab, you have run out of dilute Sulphuric acid. You require dilute H2SO4 for an important synthesis but only have concentrated Sulphuric acid, water and a glass beaker. How will you synthesize dilute H2SO4 ?
By adding water slowly to the concentrated 
taken in a glass beaker and stirring continuously
By adding concentrated 
to water taken in a beaker and stirring continuously
It is not feasible to prepare dilute dilute 
from concentrated 
The correct option is B By adding concentrated to water taken in a beaker and stirring continuously
The question might look silly but it has tremendous implications. The dilution process is very exothermic. In fact, every step of the process to convert elemental Sulphur into Sulphuric acid is exothermic with the overall reaction evolving 535kJ.mol−1
Which one do you think will be more violent – adding water to the acid or adding acid to the water?
It is the latter. Adding concentrated H2SO4 to water taken in a beaker slowly, while stirring throughout the process is the best way to obtain dilute H2SO4 . This offers a greater degree of control.
By adding concentrated to water taken in a beaker and stirring continuously
The question might look silly but it has tremendous implications. The dilution process is very exothermic. In fact, every step of the process to convert elemental Sulphur into Sulphuric acid is exothermic with the overall reaction evolving 535kJ.mol−1
Which one do you think will be more violent – adding water to the acid or adding acid to the water?
It is the latter. Adding concentrated H2SO4 to water taken in a beaker slowly, while stirring throughout the process is the best way to obtain dilute H2SO4 . This offers a greater degree of control.
