Why should we always pour acid in water not water in acid?

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Manoj Dubey

IGCSE & IB math teacher since 2004

Because acid is hygroscopic. The water will bounce out. If you add water chances of accident is very high.
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Mixing of water and acid is a highly exothermic process. When water is added to acid , due to small amount of water, evolved heat will change it to vapour and acid will spill out and may cause injury. So it is advised to mix acid to water and not water to acid
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Because when will we pour water in acid then the acid will over flow it will be danger for us.
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Rahul, If you are pouring acid in water, the energy released due to acid water interaction is absorbed by water which is present in larger amount as compared to acid. Now if you do it the other way , the energy in this case will be absorbed by the small amount of water you are adding. As a result that...
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Rahul, If you are pouring acid in water, the energy released due to acid water interaction is absorbed by water which is present in larger amount as compared to acid. Now if you do it the other way , the energy in this case will be absorbed by the small amount of water you are adding. As a result that water will splash out of the vessel carrying along with it particles of acid. Therefore to avoid any causality we add acid to water. Hope this solves your doubt. read less
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C.I.C(Certificate Course in computing)From IGNOU,Delhi M.Sc.(Entomology),Magadh Univ. B.Ed (Science) from VBU,Hazaribagh,Jharkhand

Water is not added to acid as it is an ex otherwise process in which so much heat is produced that splashing of acidic solution may occur, even container may break and can be fatal to the person.
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Chemistry Online trainer/Lecturer/Content developer

A large amount of heat is released when strong acids like Sulphuric acid,HCl are mixed with water. First,adding more acid releases more heat,as it is exothermic. (a) If you add water to acid, it forms extremely concentrated solution of acid initially. So much heat is released that the solution may...
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A large amount of heat is released when strong acids like Sulphuric acid,HCl are mixed with water. First,adding more acid releases more heat,as it is exothermic. (a) If you add water to acid, it forms extremely concentrated solution of acid initially. So much heat is released that the solution may boil very violently, splashing concentrated acid out of the container and all this because acid is exothermic and corrosive. (b) On the other hand, adding acid to water, the solution that forms is very dilute and the small amount of heat released is not enough to vaporize and spatter it. So it is always safe to add Acid to water, and never the reverse. I hope you understand. read less
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Headstart to assured 95+ score in math

Its exothermic reaction & you need to save your face.
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Electronics engineer looking to teach students in simple yet effective ways

This is because adding water to concentrated solutions of acid may result in release of tremendous heat which may result in splashing of acid or other precarious results. Pouring acid in large amount of water result in diluted solution with very less heat release.
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Aspirationist

A large amount of heat is released when strong acids are mixed with water. Adding more acid releases more heat. If you add water to acid, you form an extremely concentrated solution of acid initially. So much heat is released that the solution may boil very violently, splashing concentrated acid out...
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A large amount of heat is released when strong acids are mixed with water. Adding more acid releases more heat. If you add water to acid, you form an extremely concentrated solution of acid initially. So much heat is released that the solution may boil very violently, splashing concentrated acid out of the container! If you add acid to water, the solution that forms is very dilute and the small amount of heat released is not enough to vaporize and spatter it. So Always Add Acid to water, and never the reverse. read less
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Because water is added on pour acid heat is produced but its heat absorbing by acid so it is cause of burn.
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