Fuming Sulphuric acid is a solution of___ % SO3 in H2SO4?
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Sulfuric acid is a solution of sulfur trioxide in water. When the anhydride SO3- is added to the solution above 100 wt%, it reacts with H2SO4 to form H2S2O7, called pyrosulfuric acid , fuming sulfuric acid or oleum.
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