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Topic: concentrated sulfuric acid in lab  (Read 1922 times)

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Offline sci994

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concentrated sulfuric acid in lab
« on: April 08, 2011, 08:18:05 AM »
After using concentrated sulfuric acid in laboratory, should it be neutralized with NaOH...If not what to do with the rest of concentrated acid? Thanks  :) :) :) :) :) :)
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Offline DevaDevil

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Re: concentrated sulfuric acid in lab
« Reply #1 on: April 08, 2011, 09:56:15 AM »
you can best neutralize it with a slightly less strong base (less excessive reaction), for example calcium carbonate (chalk) powder. carbon dioxide will escape to the air and you will be left with mainly harmless calcium sulfate salt.

be aware to do this safe: add the acid very gently in small portions to the chalk, else the reaction will get very hot.
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