Good advice, I'll do that. That does raise the question of how much agitation we're going for. So, you're not trying to draw a vortex to the bottom of the flask? Sorry for my ignorance, but I've not used one of these before.You should try that 1/2 in stir bar before ordering another one. I've used 1/2 in the lab before in 2000 mL beakers and they worked just fine. As Randar said, you aren't looking to sink a container ship here, you just need a nice dimple. If you can get that bar to spin and stay centered in your flask then you should be set.
1" stir bar w/ pivot ring works for me and is perfect for the length of the hard drive magnets.
This size works for 250 ml all the way up to 5000ml flasks I use. You don't need a huge vortex, just continuous agitation. 1.5" works ok too, but 1" is the sweet spot for me.
I have had ZERO luck on my DIY stir plate with the 2" stir bar. Maybe with a different magnet config it would work, but not with the 2-stacked hard drive crescent magnet config, IMO
I use these. I love them.
\http://www.grainger.com/product/LAB-SAFETY-SUPPLY-Magnetic-Stir-Bar-21R593?s_pp=false
The nice thing is they won't shoot down the drain when you pour them out like the straight ones. I've lost a few that way.
They're less likely to get thrown.
A guy on E-Bay has them cheap every now and again.
GULP!........That's a pricey stir bar from Grainger there!!!!!
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