fuming sulfuric acid
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What is the normal range for the titration content of fuming sulfuric acid?
H2SO4·xSO3 is a sulfuric acid solution of sulfur trioxide. A colorless to light brown, viscous, fuming liquid; its density, melting point, and boiling point vary depending on the SO3 content. When exposed to air, the volatile SO3 combines with water vapor in the air to form tiny droplets of sulfuric acid, resulting in smoking; hence it is called fuming sulfuric acid. The typical mass fractions of SO3 are 20%, 40%, 60%, 66%, etc. When converted to the mass percentage of sulfuric acid, the H2SO4 content in fuming sulfuric acid can exceed 100%. Some people believe that fuming sulfuric acid mainly contains pyrosulfuric acid (H2S2O7). It has strong oxidizing, absorbent, dehydrating, and corrosive properties. Used in the synthesis of dyes and drugs. It is commonly used as a sulfonating agent and a water-absorbing and dehydrating agent.
It depends on the concentration requirement; generally, it’s ±0.3%