Hi, I recently had a lab where I had to separate a mixture of benzoic acid and benzil. So, I dissolved the mixture in ch2cl2 and then added NaOH in order to convert the benzoic acid into its sodium salt. At anyrate, this then produced the aqueous and organic layers. However, I noticed that the organic layer (the yellow one) was on the bottom and the aqueous was on the top which makes sense since ch2cl2 is more dense than water, but there was a thin yellow layer on top of the aqueous layer. How did that yellow layer get up there if it is indeed more dense than water? My yield of benzil was a little low so I'm assuming that part of it was included in my benzoic acid.