SO3 is not absorbed in water directly because
Correct answer: C. Dilute acid is produced
- A. Reaction is exothermic
- B. It is insoluble in water
- C. Dilute acid is produced
- D. All of the above
Explanation
When sulfur trioxide (SO3) reacts with water, it forms sulfuric acid (H2SO4). The reaction is as follows:SO3 (g) + H2O (l) → H2SO4 (aq) + heatSO3 (g) represents sulfur trioxide in the gas phase.H2O (l) represents water in the liquid phase.H2SO4 (aq) represents sulfuric acid in the aqueous phase (dissolved in water).+ heat indicates that the reaction is exothermic, meaning it releases heat.Sulfur trioxide is not absorbed directly in water because the reaction is highly exothermic and produces a concentrated and corrosive sulfuric acid. The heat released during the reaction can lead to a violent and uncontrollable reaction. Therefore, the absorption of SO3 in water is typically carried out using a two-step process, where the SO3 is first absorbed in a less reactive medium, such as sulfuric acid, and then diluted to form the desired concentration.
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