[Messi]

Hi guys,

I am doing a reaction under inert gas so I am using syringes with needles to transfer my chemicals into my RBF.

What is the proper technique when using syringes. I heard that it is good practise to insert syringe into RBF to absorb some argon so my syringe does not contain any atmosphere gas.

Is this true?

[discodermolide]

Yes this true. You simply flush out the air in the syringe with inert gas a couple of times. Then fill it again with the inert gas and inject it into the bottle. This creates a slight overpressure in the bottle which helps fill the syringe. You only do this if you are syringing smallish quantities, < 10mL otherwise you will create too much overpressure. Then you need to move to a canula.

[Messi]

Then fill it again with the inert gas and inject it into the bottle.

Does "into the bottle" refer to the bottle with my chemical?

[discodermolide]

Yes it does.
I say this because if you don't do this by simply syringing out the liquid you will create a partial vacuum, and if the volume is largish you will not get it out. Thus by injecting the inert gas you prevent this.

[Messi]

Thanks!

Also, as a side note sometimes when I take chemicals out of my bottle I can't tell if I got any liquid out. How can I tell if I actually have sucked up some chemical in my syringe?

[discodermolide]

Look at what goes into the syringe. Or hold the bottle up to a light and see where the needle is in relation to the liquid.

[Messi]

Thanks boss for all the *delete me*

[discodermolide]

No problem:))

[synthon]

I'm learning so many fun tricks today, I usually keep the reagent under a little N2 pressure, while drawing out of the bottle.  I think this way will be much faster though, and prevent overpressurizing the reagent bottle (and syringe).