[kovsky]

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?

[gfunk]

Precipitate Br with AgNO₃ and do a gravimetric analysis?

[russellm72]

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