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Author: Subject: SO3 -> H2SO4 question

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[*] posted on 23-1-2010 at 01:31
SO3 -> H2SO4 question

Sorry if this has been already covered. Obviously hydrating SO3 with water will yield H2SO4..but doing so directly I'd imagine is prolly pretty dangerous since the reaction would without a doubt give off heat, and spitting oleum isn't exactly a good thing :p How would one go about hydrating SO3 to obtain H2SO4 in a controlled, safe manner?
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Hazard to Others

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[*] posted on 23-1-2010 at 03:14

In industry, they add it to concentrated H2SO4 to make it even more concentrated.
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[*] posted on 23-1-2010 at 03:51

More precisely, SO3 is added to cold concentrated H2SO4 with stirring, and a refrigeration loop is used to remove heat at a rate sufficient to keep the product below the bp of SO3 so that redistillation does not occur.

See Merck for the heats of reaction. A little consideration of the stoichiometry, molecular weights and densitiies (and boiling points) will be revealing.

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