If u add water to acid there are chances that the container may explode but if we add acid to the the water it will not explode it will get diluted
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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 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 ,never the reverse.
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