Concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ is diluted by adding drop by drop\

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Professor PC Thomas Classes · Answer

(b) : Reaction between a concentrated acid and water is highly exothermic. Hence, during dilution of concentrated acid, drop by drop acid should be added to water with constant stirring so that less amount of heat is released in the process that can be absorbed by water. \ Commonly made mistakes - Be cautious, never add water to acid directly (highly exothermic reaction).