tekkado
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flasks and heating
I've been wondering had a little search and cant seem to come to an answer.
RB flasks V. FB flask?
Whats the big difference? The only one i can see from what i read (I don't put much faith in it) is that flat bottom flasks wont hold up well with
vacuum??
Thanks
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TheChemiKid
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Well flat bottom flasks are flat on the bottom, so they cannot be heated as well by a heating mantle. This should definitely be posted in beginnings.
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tekkado
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apologies.
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Dr.Bob
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Put much faith in it, flat bottom flasks and any flask with a flat side or sharp corner should not be placed under a vacuum unless it is specially
made for it. They are very weak at corners and flat spots. Most people use round flasks for organic synthesis as they are easier to stir
magnetically, since the stir bar stays centered easily.
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Metacelsus
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There are special flat bottom flasks designed for vacuum, however.
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phlogiston
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The only real advantage of flat bottom flasks is that you can place them on a surface without further support.
Some of the disadvantages include that they are generally less/non-resistant to vacuum, and heating them in a mantle is less uniform.
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"If a rocket goes up, who cares where it comes down, that's not my concern said Wernher von Braun" - Tom Lehrer |
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subsecret
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They can, however, be heated more easily on a hot plate, but a heating mantle is always better.
Fear is what you get when caution wasn't enough.
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