DDTea
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19/22 or 24/40 ???
I am getting ready to invest in a good distillation setup as well as general lab glassware. My question now, though, is whether to have 24/40 joints,
or 19/22 joints.
I like 24/40 because that seems to be a very common size, and therefore easy for me to find. However, I like 19/22 because it is cheaper. What sizes
do you all use? And for me, which would you recommend?
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rikkitikkitavi
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It really doesnt matter much, what is important is the size of the round bottomed flask you are planning to use.
Hard to find 100 ml flasks with 24/40 fittings and vice versa hard to find 19/22 1 liter flasks. Adapters solve this though.
/rickard
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Nick F
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Personally I have a 1L rb flask with a 24/29 socket, and a reducer so that I can use it with the rest of my glasswear, which is 14/23. I use this size
because I got my first stuff second hand and couldn't choose it, and naturally I bought everything else to fit it.
If you are generally going to be working on a larger scale, go with larger joints because otherwise you'll need a lot of adaptors, which are
surprisingly expensive - it was £7.96 for my 24/29 -> 14/23 reducer!
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DDTea
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Another question, this one related to how Boiling Flasks are measured...
When you boil/distill, the Flask should be only half filled, correct? It should not be over-filled or under-filled. As such, when they say "500
ml RB Flask," do they mean that the Flask holds a maximum of 500 ml, or that it can effectively boil 500 ml?
That is to say, in a 500 ml Flask, should I boil 250 ml or the full 500 ml?
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blindreeper
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Well I think it just mean the capacity of it...
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NERV
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I am farly sure that it means it will hold 500ml of liquid. So if you filled it up to the start of the kneck you would have 500ml of whatever you
filled it up with. That may be incorrect though as I have never tried to measure.
Vir sapit qui pauca loquitur.
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