On 5/8/2017 7:56 PM, whit3rd wrote:
On Saturday, May 6, 2017 at 9:21:13 PM UTC-7, wrote:
In orgo labs we used acetone to be sure there was no water left on glassware.

Acetone (spozably) evaporates completely.

There's better for that, though, because acetone is hygroscopic. It
pulls in water from the air. If you can blow off droplets and bake dry afterward, alcohol
is just as good, and less expensive.

Why is that a concern? It is hygroscopic until it forms the azeotrope.
Even that ratio will still dissolve more water into it and the residue
evaporate readily. No need to blow drops off, acetone is very thin and
in a few seconds evaporates totally.

--

Rick C