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Topic: Why more mass after reaction?  (Read 3083 times)

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Offline jamesyboy1990

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Why more mass after reaction?
« on: June 01, 2007, 03:46:58 PM »
2KBr + MnO2 + 2H2SO4 (aq) --> MnSO4 + K2SO4 + 2H2O + Br2

in this reaction, bromine is produced. I added all the reactants and let the reaction go on for two hours in a fume hood. However, when i weighed the dish with the remaining products (expecting some mass to be lost due to the bromine vapor escaping), there was actually more mas than before. Why?
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Offline Borek

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Re: Why more mass after reaction?
« Reply #1 on: June 01, 2007, 04:39:27 PM »
Lousy weighting? ;)

The only thing I can think of is that H2SO4 is strongly hygroscopic when concentrated.
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Offline Yggdrasil

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Re: Why more mass after reaction?
« Reply #2 on: June 01, 2007, 04:50:48 PM »
How much more mass was there (1% increase, 10% increase, huge increase)?

I would not expect much Br2 to escape from the reaction.  Br2 is barely a gas at RT and is quite happy sitting around in aqueous solution.
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