Suggest two reasons to explain the addition of 100 cm^3 of distilled water to the hydrochloric acid in the beaker
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The addition of acid to water make it easier for the reaction so that the acid gets diluted safely. On the other hand if water is added to acid it will get splash vigrously and may injure the hand of the chemist. The addition of water directly to acid contribute to exothermic reaction and releases more heat which may result in spraying around.
Adding acid to water, resutl in solution with very dilute solution and releases small heat. This small heat is not sufficient even to vaporises a single drop of water.
Thus, adding acid to water is safer for dilution.
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