Can buffer solutions be used to control the pH of ethanol?
Although pH scale is rather strictly used for aqueous solutions, the concept of pH in organic or non-aqueous solutions is not trivial. It is called apparent pH or operational pH when organic solvents are present. There is a practical problem here as well, do you think your buffers will dissolve in ethanol? Once you figure this out, you can read a section in  "pH measurements in Nonaqueous Solvents" by Laitinen &amp; Harris, “Chemical Analysis ─ An Advanced Text and Reference". It is a very useful book.