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Author Topic: Boron tribromide (BBr3) concentration  (Read 2953 times)

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kovsky

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Boron tribromide (BBr3) concentration
« on: February 02, 2010, 10:45:24 AM »

Hi all,

We have a bottle of old BBr3 solution (1M in hexanes) in our lab and I am constantly using it. Hovewer, I have some doubts that the real concentration is not 1M anymore.

Anyone knows how I could determine the concentration?

Notes:
- 11B NMR of it has only one peak, so, no other boron species in there;
- the color of the solution is dark grey.
- I thought about hydrolyzing it to B(OH)3, but then how to separate boric acid from other possible solids?
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gfunk

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Re: Boron tribromide (BBr3) concentration
« Reply #1 on: February 03, 2010, 02:04:52 PM »

Precipitate Br with AgNO3 and do a gravimetric analysis?
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Grad Student - Organic Chemistry
University of Alberta

russellm72

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Re: Boron tribromide (BBr3) concentration
« Reply #2 on: February 10, 2010, 01:35:08 AM »

Sorry that sounds like a mare!

I remember my bottle of BBr3 being orange. Is it not working? Why not just add more if it isnt...

Or just buy a new bottle its not expensive...

R
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