Austin - 4-11-2016 at 14:23
Hey all,
I recently mixed a solution of acetone and methanol with 98% Isopropanol (which I gathered from 70% solution by salting out) and there is clearly a
layer seperation. The top layer is the Isopropanol (smell and amount which I used) and the bottom layer is clearly the acetone methanol solution.
Supposedly acetone and Isopropanol are miscible, yet there is clearly a seperation of layers?? What gives?
I hypothesize that some salt (a small amount) dissolved into the Isopropanol and helps it dissociate from the acetone-methanol solution?
What is your input?
aga - 4-11-2016 at 15:16
A photo ?
unionised - 4-11-2016 at 16:44
"98% Isopropanol (which I gathered from 70% solution by salting out)"
Who says it's 98%?
DraconicAcid - 4-11-2016 at 16:54
Acetone, isopropanol and methanol are miscible. If you've got something that's not mixing with acetone and methanol, it's not isopropanol. Maybe
it's the saturated salt solution that you got from trying to salt out the isopropanol?
Tsjerk - 5-11-2016 at 12:29
Is a mixture of methanol acetone isopropanol and water fully miscible? I would guess it is, but if not water is a likely candidate to mess things up.
What salt did you use to salt out the iso-prop? And I wouldn't call smell and or amount good indicators for compound identification in this case, at
all.
alking - 8-11-2016 at 17:35
My guess is you pulled some water and salt over so you have a partially miscible solution of the 4 liquids plus some salt. Afaik they are all fully
miscible, but salt is only substantially soluble in the water which can obviously have an impact on things. I can't tell you exactly what is going on
beyond that, but I'd be surprised if that bottom layer does not contain at least salt and water.