I have a case with two liquids: Water and another chemical which is miscible in water. The chemical has a density of 800 g/l so it's 20% less dense than water.
Initially the chemical was mixed with the water but now it has been sitting stagnant for 20 years.
Since such a long time has passed what could I expect to see in terms of the mixing of the liquids? Will the different densities have caused the two liquids to separate? Will there still be a trace of the chemical dissolved in the water?