[Delta What?]

In a lab we oxidized benzhydrol to produce benzophenone. We use glacial acetic acid and sodium dichromate dehydrate to oxidize the benzhydrol. Then we set up the first extraction with water and CH2Cl2 and the second with NaHCO3 and CH2Cl2.

I am trying to figure out what all of the chemicals used are doing.
Especially what the glacial acetic acid is doing?
I am also not quite getting the purpose of the NaHCO3.

I believe that the dichromate is a catalyst that produces a complex with the benzhydrol.
I can't figure out what the acid is doing. My major barrier is that I thought that the lab was trying to remove the hydrogen from the benzhydrol (oxidize it) and wouldn't the acid get in the way of this since it is all to willing to give up its proton (I am guessing more so then the benzhydrol).

[phth]

Can you draw and post the mechanism of the reaction with acetic acid, and without acetic acid?  What does glacial mean?