I guess I am not totally clear:
Why is the Sudan IV in a mixture of ethanol and water instead of just plain water?
What if it were in just water or just ethanol?
I think I was misled in lab so not totally sure. I see Sudan IV has both nonpolar and polar regions so I am thinking ethanol kind of bridges the two (Sudan IV and water). But the hexane draws out the Sudan so it can also be highly attracted to nonpolar hexane.
One question asked what the dominant intermolecular force present in Sudan IV was and I said London Dispersion since it interacts with nonpolar hexane and got that wrong?