# Chemical Forums

## Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: isshin on September 15, 2021, 05:51:20 PM

Title: What does "Phosgene solution 15 wt. % in toluene" mean?
Post by: isshin on September 15, 2021, 05:51:20 PM
The bottle contains 100mL of a solution labelled as phosgene solution 15wt. % in toluene. I need 5mmol of phosgene, which equals to 0.4946g. So, I am wondering how much solution should I draw up from the bottle to have 0.4946g of phosgene? The density of the entire solution displayed on the bottle is 0.924 g/mL
Title: Re: What does "Phosgene solution 15 wt. % in toluene" mean?
Post by: Corribus on September 15, 2021, 11:10:13 PM
It means the solution is 15 % by weight of phosgene. I.e., if you were to weigh out 100 g of the solution, 15 g would be phosgene and 85 g would be solvent.
Title: Re: What does "Phosgene solution 15 wt. % in toluene" mean?
Post by: wildfyr on September 16, 2021, 08:11:45 PM
Gotta say, I'm kind of terrified for someone who doesn't know how to sort this out on their own to be handling a phosgene solution. It is REALLY hazardous stuff, and that sort of calculation is something an experienced organic chemist does 3x a day.
Title: Re: What does "Phosgene solution 15 wt. % in toluene" mean?
Post by: rolnor on September 17, 2021, 06:50:13 AM
Yes, it was used as chemical weapon in ww2.
Title: Re: What does "Phosgene solution 15 wt. % in toluene" mean?
Post by: hollytara on September 19, 2021, 11:41:14 AM
I have worked with phosgene.  It is not to be trifled with.  You can inhale a lethal amount and not know it until the symptoms begin a day or so later.  If you are uncertain about these things, be sure and get someone experienced to help you.
Title: Re: What does "Phosgene solution 15 wt. % in toluene" mean?
Post by: rolnor on September 20, 2021, 04:43:41 PM
You can use triphosgene in most cases, this material is a solid and easy to handle. Fumehood is always necessary.