What would theoretically be dissolved in the interior oceans of icy moons and planets?
There is no guarantee of solutions for life (known), but basically you need solutions of anions and cations, as phosphates for building long chains as well as maintaining neutrality (acid and electronic equilibrium) weather, or any CHONSP (carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus) with neutral acid (water) solution but this only applies for well known carbon life.