Mabus
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Round vs flat bottom evaporating dish
I bought a flat bottom one a few weeks ago to dry a solution, worked pretty good, though I can't see if there are any advantages over a round bottom
one.
Are there any significant differences between these two?
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Sulaiman
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I do not know whether round or flat is best,
I just want to mention that borosilicate petri dishes with covers are presently quite cheap via eBay,
they can be used as a petri dish, or as two evaporating dishes 
CAUTION : Hobby Chemist, not Professional or even Amateur
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Mabus
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The only thing I do not like about using Petri dishes as evaporating dishes is that it's really annoying to scoop up the solid from the edges. I used
one a while ago to grow some crystals, and while I liked that I could scrape off the solid from the flat surface easily, getting it out of the edges
was frustrating.
[Edited on 6-5-2018 by Mabus]
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Doc B
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Flat bottom dishes are better than round when being heated upon an electric hotplate. While round dishes are better than flat when being heated by a
bath or open flame.
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alking
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One thing that comes to mind is that it depends what you are evaporating. If you're collecting a liquid then a round one will be better because it
would all be concentrated in the center where as with a flat one it will pool all around the edges and you'll have a lot more mechanical loss. I'd
imagine to a lesser extent flat ones are better for solids/crystals since they are easier to scrape up on a flat surface than a curved one.
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