Chemical Forums

Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: superg on May 02, 2008, 01:06:04 AM

Title: CDCl3 + silver foil
Post by: superg on May 02, 2008, 01:06:04 AM
hello,
i've got some CDCl3 with a little piece of silver foil in. what this silver foil is for?removing acidity?stabilization?
thanks
Title: Re: CDCl3 + silver foil
Post by: macman104 on May 02, 2008, 01:43:04 AM
Quote from: superg on May 02, 2008, 01:06:04 AM
hello,
i've got some CDCl3 with a little piece of silver foil in. what this silver foil is for?removing acidity?stabilization?
thanks
Was it sealed when you opened it?  I've never opened a fresh bottle of CDCl3 to find anything but the liquid in it, nor have we ever added anything to our bottles.
Title: Re: CDCl3 + silver foil
Post by: sjb on May 02, 2008, 05:24:32 AM
Quote from: macman104 on May 02, 2008, 01:43:04 AM
Quote from: superg on May 02, 2008, 01:06:04 AM
hello,
i've got some CDCl3 with a little piece of silver foil in. what this silver foil is for?removing acidity?stabilization?
thanks
Was it sealed when you opened it?  I've never opened a fresh bottle of CDCl3 to find anything but the liquid in it, nor have we ever added anything to our bottles.

Not even a pinch of K2CO3 to act as a dessicant - or are you doing so much chemistry that the chloroform doesn't get a chance to get wet? ;)
Title: Re: CDCl3 + silver foil
Post by: Arkcon on May 02, 2008, 06:40:24 AM
Quote from: superg on May 02, 2008, 01:06:04 AM
hello,
i've got some CDCl3 with a little piece of silver foil in. what this silver foil is for?removing acidity?stabilization?
thanks

Could the foil liner of the cap have fallen into the bottle?
Title: Re: CDCl3 + silver foil
Post by: macman104 on May 02, 2008, 05:06:38 PM
Quote from: sjb on May 02, 2008, 05:24:32 AM
Not even a pinch of K2CO3 to act as a dessicant - or are you doing so much chemistry that the chloroform doesn't get a chance to get wet? ;)
Nope.  We just have small bottles of CDCl3, we keep 'em in the fridge, and we use 'em when we need 'em.  But we do quite a NMR here...
Title: Re: CDCl3 + silver foil
Post by: superg on May 02, 2008, 09:56:38 PM
hello,
the bottle was bought with the silver foil in, it's write on the bottle "CDCl3 with silver foil" on.one guy on a french chemistry forum say to me that it's forum limiting the water in the chloroform, but how silver can do that? i think it's much more for decreasing the acidity of the CDCl3...
bye